Exhaust cooling system for vehicles

ABSTRACT

An exhaust gas cooling system for a vehicle includes a cooling fin system retrofit and a side exhaust pipe retrofit having an exhaust gas exit pipe having a first portion having a plurality of mixing portions which are either bends or internal mixing fins configured to mix vehicle exhaust gas, but not to restrict exhaust gas flow, a second portion fastened to the first portion and a chrome coated third portion fastened to the second portion and extending along the side of the vehicle. The cooling fin system retrofit includes an adjustable clamp and one or more cooling fins, each cooling fin having a base having a pair of upstanding arms, with one arm of the pair having a lip for engaging an arm of another cooling fin. An exhaust gas cooling system kit, a side exhaust pipe retrofit kit, a cooling fin kit are included.

CROSS-REFERENCE TO RELATED APPLICATIONS

Not Applicable

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not Applicable

BACKGROUND OF THE INVENTION

This invention relates generally to exhaust gas cooling systems forvehicles and in particular, to an exhaust gas exit pipe, to a sideexhaust pipe retrofit, to a cooling fin, to a cooling fin systemretrofit, to an exhaust gas cooling system kit, to a side exhaust piperetrofit kit and to a cooling fin kit. The invention is particularlywell-suited for retrofitting a side exhaust pipe to a vehicle using thevehicle's original catalytic converters, original Y pipe or H pipe,original headers and manifolds and the original placement of mufflersand for retrofitting a cooling fin system to the vehicle's exhaustsystem, e.g., the vehicle's muffler, Y pipe or H pipe, inlet tube andoutlet tube of the muffler, catalytic converter or engine parts, suchas, but not limited to, manifolds, oil pan, engine block, and bellhousing.

A most difficult problem is cooling vehicle exhaust gases. Vehicleexhaust gases passing from the engine manifold often reach 900 degreesto 1500 degrees Fahrenheit. Typically the exhaust gases exit from themanifold through the exhaust pipe and enter a muffler with temperaturesof 1150-1250 degrees Fahrenheit. Under most circumstances, the mufflertemperature (caused by the engine exhaust gases passing through it) in avehicle does not exceed 1000 degrees Fahrenheit. However during extremecircumstances, such as during hard acceleration of the vehicle, duringthe climbing of altitude with the vehicle, e.g., going up a steepincline, or mountain, pulling a trailer with the vehicle or driving thevehicle during extreme outdoor temperature, e.g., desert daytemperatures, the temperature of the automobile muffler should notexceed 1250 degrees Fahrenheit. The exhaust gases pass through themuffler and then pass out through a tail pipe or through a side exhaustsystem and then exit from the vehicle. Thus, the exhaust gases also giveoff their heat to the side exhaust system.

A vexatious problem, largely unattended in the art, is the lack of anexhaust gas cooling system for vehicles which utilizes a side exhaustpipe retrofit on the vehicle and a cooling fin system retrofit. The useof elongate exhaust pipes is known, e.g., see, U.S. Pat. No. 5,388,408to Lawrence, U.S. Pat. No. 3,070,187 to Deremer, U.S. Pat. Nos.2,805,548 and 2,706,014 to Carroll.

Sporty-looking vehicles having a side exhaust system, e.g.,"performance" vehicles, are desirable for the car or truck enthusiastwho desires the beautiful appearance of a chrome coated side exhaustpipe, e.g., lake pipe, mounted on the exterior side of the vehicle justbelow the vehicle's doors. This location of the side exhaust pipe alsoadvantageously places the deep booming sound of the exhaust system at alocation on the outside of the vehicle allowing the driver to hear thepleasurable deep booming sound of the engine. The very desirablecharacteristic of placing the side exhaust pipes in the historic andaesthetically pleasing location on the sides of the vehicle just belowthe doors of the vehicle, unfortunately poses a heat safety hazard forpersons and pets who might come in contact with the side exhaust pipe.Unfortunately these persons and pets may suffer burns to the legs andhands (or legs and paws for pets) from accidentally contacting the hotside exhaust pipe and/or shield. Also, the side exhaust pipe and mufflermay be so hot as to ignite combustible materials located near the groundor suspended on vegetation which come into contact with the side exhaustpipe and/or the muffler.

Furthermore, due to the excessive heat build up in the side exhaustpipe, the attractive chrome coating of the side exhaust pipe becomesburnt giving a characteristic "blues-out" or "blued-out" appearance or"browned-out" appearance, as is known to those automobile hobbyists(enthusiasts). By "blues-out", "blued-out" or "browned-out", is meantthat the chrome coating has a blue black tint to it, rather than alustrous, shiny chrome appearance.

The excessive heat can also cause deterioration to a vehicle's exterior,discoloring the vehicle's paint and wrinkling plastic parts, such asplastic bumpers and plastic ground effects. In addition, due toexcessive heating of the entire exhaust system in the vehicle, includingmufflers, connecting pipes, clamps, brackets, emission equipment, aswell as, the side exhaust pipe, passengers are sometimes inconvenienced,since the excessive heat sometimes creates hot floor pan areas and evenhot passenger compartments in the vehicle.

In the past, the industry servicing the performance vehicle enthusiast,e.g., the "performance exhaust industry", has strived to solve theproblem of better performance exhaust with increased horsepower,increased fuel economy, increased torque, increased acceleration andincreased life of mechanical parts. The term "performance" meanshereinthroughout, that the vehicle (automobile or truck) has lessrestrictive exhaust gas flow and volume as compared to conventionalvehicles. In the art, a performance exhaust system is an exhaust systemthat provides for increased flow of exhaust gas as compared to typicalexhaust system configurations and the performance exhaust systemprovides for increased sound production as compared to typical exhaustsystems for vehicles in a same vehicle class. Also the performanceexhaust system is typically constructed of superior materials ascompared to typical original equipment in both appearance anddurability. Furthermore, a performance system is at least one pipe sizelarger than the pipe installed at the factory on a given vehicle.

Presently the performance exhaust industry uses exhaust pipes having atubing inner diameter or pipe diameter, e.g., "pipe size", of a minimumof 1 and 7/8 inches. The inlet tube and the outlet tube are stock sizedto fit the exhaust pipe diameter. The entire performance exhaustindustry has desired to use larger diameter exhaust pipes, e.g., 2.25inch, 2.5 inch, 2.75 inch, 3 inch or greater diameter exhaust pipes, tocreate better sound and to create a better appearance, e.g., largerexhaust pipes, but has not been able to fully utilize the largerdiameter side exhaust pipes because the larger inner diameter causesmore exhaust gas heat to pass through to the side exhaust pipes, causingthe entire exhaust gas system to become about as hot as the enginemanifold itself, e.g., 900 degrees Fahrenheit to 1500 degreesFahrenheit.

Some prior art, e.g., U.S. Pat. No. 2,096,260 to Pavillon has attemptedto respond to some of the heat safety problems of placing elongateexhaust pipes alongside the sides of the vehicle, by utilizing heatshields and heat insulation pads to help avoid injuries.

Some prior art has attempted to respond to cooling of automotive enginepart using fins for cooling, e.g., for mufflers, see U.S. Pat. No.3,187,834 to Bryson et al, U.S. Pat. No. 1,671,829 to Ledwinka and foroil filters, see, U.S. Pat. No. 5,305,824 to Gasseling, U.S. Pat. No.2,798,695 to Arleque. None of the prior art has responded with a simpleto use cooling fin system retrofit which is easily assembled, whichallows selection of cooling fins varying in fin base dimensions, finspacing, fin height, selection of fin number, and which in the coolingfin design allows for air flow through a portion of the cooling finitself.

Thus, notwithstanding the many known practical design problems forproviding a cooler side exhaust pipe which when made of chrome or platedwith chrome does not become burnt, which delivers engine sound to thedriver at the driver's location, which does not result in hot floor panareas and hot passenger compartments due to the exhaust system and whichpermits the use of larger diameter side exhaust pipes, the art has notadequately responded to date with the introduction of an exhaust gascooling system for a vehicle utilizing a side exhaust pipe retrofitand/or a cooling fin system retrofit.

BRIEF SUMMARY OF THE INVENTION

The present invention provides an exhaust gas cooling system forvehicles and in particular, an exhaust gas exit pipe, a side exhaustpipe retrofit, a cooling fin, a cooling fin system retrofit, an exhaustgas cooling system kit, a side exhaust pipe retrofit kit and a coolingfin kit. The invention is particularly well-suited for easilyretrofitting a side exhaust pipe to a vehicle using the vehicle'soriginal catalytic converters, original Y pipe or H pipe, originalheaders and manifolds, and original placement of mufflers and also foreasily retrofitting a cooling fin system to the vehicle's exhaustsystem, e.g., the vehicle's muffler, Y pipe or H pipe, inlet tube andoutlet tube of the muffler, catalytic converter or engine parts, suchas, but not limited to, manifold, oil pan, engine block and bellhousing.

The present invention is advantageously safer for persons and pets whomay accidentally contact the side exhaust pipe and/or shield because itis cooler than prior art side exhaust pipes and/or shields.

Another advantage of the present invention is that it is more efficientand economical to use because it preserves the entire exhaust system,including not only the mufflers, but also the connecting pipes, clamps,brackets and emission equipment, by reducing heat related stress causedby expansion and contraction of these mechanical parts.

Yet another advantage of the present invention is that the chromecoating/finish on the exhaust pipe does not get subjected to the usualtemperatures of exhaust gas heat and therefor remains unaffected by theheat damage and remains unchanged as to its color, luster, shine, shape,appearance, e.g., it does not exhibit a blues-out or a browned-outappearance.

Still another advantage of the present invention is that any plasticbody parts, chassis parts, or ground effects, e.g., ground moldings(which may extend around the entire perimeter of the vehicle to give thevehicle a low, slick, sweeping look), may be retrofit with the presentinvention preventing heat stress to the plastic body parts, chassisparts or ground effects themselves or to the exhaust gas exit areas fromthe excessive heat of the exhaust gas.

Yet still, another advantage of the present invention is that passengercomfort will increase in the vehicle due to the lack of excessiveheating under the car, thus preventing hot floor pan areas, and hotpassenger compartments due to the exhaust system.

A further advantage of the present invention is that the use of largerdiameter exhaust pipes with their attractive performance characteristicsare now available to the performance vehicle enthusiasts because theproblem of excessive heating of the side exhaust pipe has been solved.

The foregoing, and other advantages of the present invention, arerealized in one aspect thereof in an exhaust gas exit pipe comprising: afirst portion, a second portion and a third portion. The first portionhas a pair of first portion ends and a first portion pipe body extendingbetween the pair of first portion ends. The pipe body has an outsidewall, an inside diameter and a plurality of mixing portions. Each mixingportion of the plurality of mixing portions is configured to mix andcool exhaust gases from a muffler of a vehicle, but not to restrict theflow of the exhaust gases. The second portion has a base and an armextending from the base. The base is fastened to one end of the pair offirst portion ends. The third portion has a pair of opposing curved endsand an elongate exhaust pipe middle part extending between the pair ofopposing curved ends. One of the pair of opposing curved ends isfastened to the arm of the second portion. The plurality of mixingportions is a plurality of bends with each bend of the plurality ofbends bent at a bend angle. The plurality of mixing portions are aplurality of internal mixing fins disposed within the first portion.

Another aspect of the present invention is a side exhaust pipe retrofitfor a vehicle comprising: an exhaust gas exit pipe, a first clamp, amounting strap, a second clamp and a pair of rubber grommets. Theexhaust gas exit pipe is as described above. The base of the secondportion of the exhaust gas exit pipe is fastened to one end of the pairof opposed ends of the first portion ends at a point of fastening. Theother end of the pair of opposed ends of the first portion is fastenedto the muffler of the vehicle with the first clamp. The mounting clampis fastened to both the point of fastening of the first portion and thesecond portion of the exhaust gas exit pipe and to the H pipe or the Ypipe of the vehicle. The pair of rubber grommets are mounted to theexterior side of the vehicle below a door of the vehicle and to theelongate middle portion of the third portion of the exhaust gas exitpipe with the second clamp. The third portion of the exhaust gas exitpipe includes a shield.

Yet another aspect of the present invention is a cooling fin comprisinga base and a pair of upright arms extending from the base with one ofthe pair of upright arms having a lip. The base and pair of upright armshave portions therein forming clamp receiving apertures. The lip of theupright arm is dimensioned to engage with an upright arm of anothercooling arm. Each clamp receiving aperture has an arm aperture portionpenetrating one of the pair of upright arms and a base aperture portionpenetrating the base. The arm aperture portion is dimensioned to permitair flow therethrough when a clamp is engaged through the pair ofaligned clamp receiving apertures. The cooling fin further comprises a"U" shaped channel having a channel thickness and the base is arectangular base with the pair of upright arms extending therefrom withthe other upright arm of the pair of upright arms having an upper edgespaced from the base. The cooling fin has a pair of channel edges in thebase and a pair of aligned clamp receiving apertures penetrating thebase and the upright arms of the cooling fin and disposed on the channeledges.

Still another aspect of the present invention is a cooling fin systemretrofit comprising: one or more cooling fins and one or more adjustableclamps. Each cooling fin has a base and a pair of upright arms extendingfrom the base with one of the pair of upright arms having a lip. Thebase and pair of upright arms have portions therein forming a pair ofclamp receiving apertures. Each adjustable clamp is dimensioned toengage within the pair of clamp receiving apertures. Each adjustableclamp either by itself or in combination with one or more adjustableclamps is dimensioned to extend around an object to be cooled.

Yet still another aspect of the present invention is an exhaust gascooling system for a vehicle comprising a side exhaust pipe retrofit anda cooling fin system retrofit both used in a vehicle to cool exhaustgases generated by the vehicle. The side exhaust pipe retrofit and thecooling fin system retrofit are as described above.

A further aspect of the present invention is a cooling fin kitcomprising one or more cooling fins, each cooling fin having a base witha pair of upright arms extending therefrom; one of the pair of uprightarms having a lip, the base and pair of upright arm portions havingclamp receiving apertures portions therein forming a pair of clampreceiving apertures. The cooling fin kit further comprises one or moreadjustable clamps, each of the adjustable clamps dimensioned to engagewithin a pair of clamp receiving apertures of one or more of the coolingfins and each of the adjustable clamps either by itself or incombination with one or more of the adjustable clamps is dimensioned toextend around an object to be cooled.

A still further aspect of the present invention is a side exhaust piperetrofit kit comprising: an exhaust gas exit pipe as described above, afirst clamp, a mounting strap, a second clamp and a pair of rubbergrommets. The base of the second portion of the exhaust gas exit pipe isfastened to one end of the pair of opposed ends of the first portion ata point of fastening. The other end of the pair of opposed ends of thefirst portion of the exhaust gas exit pipe is fastened to the muffler ofthe vehicle with the first clamp. The mounting clamp is fastened to boththe point of fastening of the first portion and the second portion ofthe exhaust gas exit pipe and to the H pipe or the Y pipe of thevehicle. The pair or rubber grommets are mounted to the exterior side ofthe vehicle below the door of the vehicle and to the elongate middleportion of the third portion of the exhaust gas exit pipe with thesecond clamp. The third portion of the exhaust gas exit pipe includes ashield. The side exhaust pipe retrofit kit further comprises a mufflerhaving an inlet tube and an outlet tube at a same end of the muffler.

A yet still further aspect of the present invention is an exhaust gascooling system kit comprising: a cooling fin kit and a side exhaust piperetrofit kit, each as described above. The third portion of the exhaustgas exit pipe of the exhaust gas cooling system kit includes a shield.The exhaust gas cooling system kit further comprises a muffler having aninlet tube and an outlet tube at a same end of the muffler. The coolingfin system kit of the exhaust gas cooling system kit further comprisesone or more adjustable clamps, each of the adjustable clamps dimensionedto engage within a pair of clamp receiving apertures of one or more ofthe cooling fins and each of the adjustable clamps either by itself orin combination with one or more adjustable clamps dimensioned to extendaround an object to be cooled.

Other advantages and a fuller appreciation of the specific attributes ofthis invention will be gained upon an examination of the followingdrawings, detailed description of preferred embodiments, and appendedclaims. It is expressly understood that the drawings are for the purposeof illustration and description only, and are not intended as adefinition of the limits of the invention.

BRIEF DESCRIPTION OF THE DRAWING(S)

The preferred exemplary embodiment of the present invention willhereinafter be described in conjunction with the appended drawingwherein like designations refer to like elements throughout and inwhich:

FIG. 1 is a view of an exhaust cooling system of the present invention,mounted in a vehicle, viewed from an underside of the vehicle, showing afirst embodiment of a first portion of an exit pipe of a side exhaustpipe retrofit and showing a cooling fin system retrofit;

FIG. 2 is a view of an exhaust cooling system of the present invention,mounted in a vehicle, viewed from an underside of the vehicle, showing asecond embodiment of the first portion of the exit pipe of the sideexhaust pipe retrofit and showing a cooling fin system retrofit;

FIG. 3 is a view of a prior art exhaust system in a vehicle, viewed froman underside of the vehicle;

FIG. 4A is an exploded view of the first embodiment of the side exhaustpipe retrofit of the present invention, shown in FIG. 1, with the mixingportions of the pipe body of the first portion of the exit pipe beingmultiple bends, where the pipe body has four bends;

FIG. 4B is another exploded view of the first, second and third portionsof the exit pipe of FIG. 4A;

FIG. 4B' is an end view of the first portion of the exit pipe of FIG. 4Ataken along 4B'--4B' of FIG. 4A;

FIG. 4C is an alternate aspect of the first portion of the firstembodiment of the side exhaust pipe retrofit of FIG. 4A, where the pipebody has three bends;

FIG. 4C' is another view of the first portion of the first embodiment ofFIG. 4C;

FIG. 4C" is an end view of the first portion of the exit pipe of FIG. 4Ctaken along 4C"--4C" of FIG. 4C;

FIG. 4D is an alternate aspect of the first portion of the firstembodiment of the side exhaust pipe retrofit of FIG. 4A, where the pipebody has five bends;

FIG. 4D' is another view of the first potion of the first embodiment ofFIG. 4D;

FIG. 4D" is an end view of the first portion of the exit pipe of FIG. 4Dtaken along 4D"--4D" of FIG. 4D;

FIG. 5A is an exploded view of the second embodiment of the side exhaustpipe retrofit of the present invention, shown in FIG. 2, with the mixingportions of pipe body of the first portion of the exit pipe beingmultiple internal mixing fins;

FIG. 5B is a view of the first portion of the exit pipe of FIG. 5A, withportions partially cut away showing the structure and alignment of theinternal mixing fins; the second portion and third portion of the exitpipe shown in FIG. 5A having the having the same side view as that ofthe second portion and third portion of the exit pipe shown in FIG. 4B;

FIG. 5C is a partial end view of two adjacent segments of FIG. 5A,illustrating the orientation of the internal mixing fins in each segmentprior to orientation of the segments and joining of the segments;

FIG. 5D is an end view of the first portion of the exit pipe of FIGS. 2and 5B viewed along 5D--5D of FIG. 5B, an end of the first portionclosest to the outlet tube of the muffler;

FIG. 6 is a view of a modification of the side exhaust pipe retrofit ofthe present invention for use with a muffler having an inlet tube and anoutlet tube at opposite ends of the muffler, the side exhaust pipehaving an additional "J"-shaped portion, and viewed mounted in avehicle, viewed from an underside of the vehicle; and also showing acooling fin system retrofit installed on the mufflers of the vehicle;

FIG. 7 is a view of an alternate heat shield made without ventillationholes used with the side exhaust pipe retrofit of the present invention;

FIG. 8A is a side view of the side exhaust pipe retrofit of the exhaustcooling system of FIGS. 1 and 2 mounted on the vehicle;

FIG. 8B is a partial cross sectional view of the attachment of the thirdportion of the exit pipe, including the shield, to the exterior side ofthe vehicle below the door, taken through section line 8B--8B in FIG.8A;

FIG. 8C is a top view of the attachment of the third portion of the exitpipe to the exterior side of the vehicle below the door, with the shieldin phantom;

FIG. 8D is an exploded view of the of the clamp and grommets forattaching the third portion of the exit pipe to the side of the vehiclebelow the door;

FIG. 9 is a perspective view of the cooling fin system retrofit of thepresent invention shown mounted around a muffler of a vehicle; with themuffler shown in phantom line;

FIG. 10 is a perspective view of a single cooling fin of the presentinvention;

FIG. 11 is a top view of the cooling fin of FIG. 10;

FIG. 12 is a partial cross sectional view of the cooling fin systemretrofit of FIG. 9, taken through section line 12--12 of FIG. 9;

FIG. 13 is an end view of two cooling fins; illustrating how coolingfins of the present invention are joined to each other;

FIGS. 14 and 15A-15C are views of additional embodiments of the coolingfin of the present invention;

FIG. 16 is a view of a cooling fin retrofit kit of the presentinvention;

FIGS. 17A-17D are views of side exhaust pipe retrofit kits of thepresent invention;

FIGS. 18A-18D are views of cooling system retrofit kits of the presentinvention;

FIG. 19A is a view of the cooling fin system retrofit installed on themufflers of the vehicle, shown in FIG. 3, as viewed from an underside ofhe vehicle, showing the locations on the vehicle where temperaturereadings were taken with a pyrometer as discussed in Example 8;

FIG. 19B is a view of the side exhaust system retrofit, includingmufflers, installed on the vehicle, shown in FIG. 2, as viewed from anunderside of the vehicle, showing the locations on the vehicle wheretemperature readings were taken with a pyrometer as discussed in Example8;

FIG. 20 is a view of the side exhaust system retrofit, includingmufflers, installed on the vehicle, shown in FIG. 1, as viewed from anunderside of the vehicle, showing the locations on the vehicle wheretemperature readings were taken with a pyrometer as discussed in Example8; and

FIG. 21 is a view of the vehicle, shown in FIG. 3, as viewed from anunderside of the vehicle, having been modified from that shown in FIG. 3by directing the exhaust gases from the H pipe directly to the DYNAMAX™exhaust systems installed on the sides of the vehicle as side exhaustpipes, and showing the locations on the vehicle where temperaturereadings were taken with a pyrometer as discussed in Example 8.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates broadly to exhaust gas cooling systems forvehicles and in particular, to an exhaust gas exit pipe, to a sideexhaust pipe retrofit, to a cooling fin, to a cooling fin systemretrofit, to an exhaust gas cooling system kit, to a side exhaust piperetrofit kit and to a cooling fin kit. The invention is particularlywell-suited for retrofitting a side exhaust pipe to a vehicle using thevehicle's original catalytic converters, original Y pipe or H pipe,original headers and manifolds and the original placement of mufflersand for retrofitting a cooling fin system to the vehicle's exhaustsystem, e.g., the vehicle's muffler, Y pipe or H pipe, inlet tube andoutlet tube of the muffler, catalytic converter or engine parts, suchas, but not limited to manifolds, oil pan, engine block, and bellhousing.

Accordingly, the present invention will now be described in detail withrespect to such endeavors; however, those skilled in the art willappreciate that such a description of the invention is meant to beexemplary only and should not be viewed as limitative on the full scopethereof.

The present invention provides an exhaust gas cooling system 20 for avehicle. The exhaust gas cooling system 20 has a side exhaust piperetrofit 22 and a cooling fin system retrofit 24 as shown in FIGS. 1, 2,and 6. The side exhaust pipe retrofit 22 as shown in FIGS. 1, 2, 4A-4D",5A-5D and 6-8D may be used without the cooling fin system retrofit 24,as shown in FIG. 19B and 20. The cooling fin system retrofit 24, asshown in FIGS. 1, 2, 6, 9-15C, may be used without the side exhaust piperetrofit 22, as shown in FIG. 19A.

For simplicity of illustration, FIGS. 1, 2, 3, 6, 19A, 19B, 20, and 21are schematic views of the an underside 32 of a vehicle 28, illustratingthe exhaust system, it is to be understood by those skilled in the artthat all other components needed to make the vehicle function arepresent, but not necessarily shown.

Most advantageously, the side exhaust pipe retrofit 22 uses a vehicle'soriginal catalytic converter, original Y pipe or H pipe, originalheaders and manifolds, and the original placement of mufflers, althoughnot necessarily the original mufflers. The side exhaust pipe retrofit 22itself contains no internal muffler 44'. As shown in FIG. 8A, the sideexhaust pipe retrofit provides a decorative feature displaying agorgeous chrome coated side exhaust pipe 62 alongside an outside of avehicle 28, providing the look of a customized roadster, and providingdeep booming engine sounds next to a driver (not shown) of the vehicle28.

To best understand the advantages of the side exhaust pipe retrofit 22,in reducing excessive heating and in maintaining the fine luster, colorand finish of the chrome, e.g., preventing blues-out or browned-out ofthe chrome plating/coating/finish of the side exhaust pipe 62, it isuseful to understand a common prior art exhaust system 30.

FIG. 3 schematically illustrates a prior art exhaust system 30 for a1990 Mustang GT vehicle, a typical rear wheel drive vehicle. In FIG. 3,the prior art exhaust system 30 is viewed from an underside 32(hereinthroughout, also "underbody 32", or "under carriage 32") of avehicle 28 having a front end 33. As best shown in FIG. 3, in most priorart exhaust systems 30, the exhaust gases from an engine manifold 34pass through a pair of catalytic converters 36 and then are transportedinto mufflers 44 using a pipe 25. The pipe 25 used to convey the exhaustgases from the engine manifold 34 to the catalytic converters can eitherbe an H-pipe 31 or a Y pipe, as is known in the art. In FIG. 3, an Hpipe 31 is used to convey the exhaust gases from the engine manifold 34,so there are two catalytic converters 36 and two mufflers 44. If a Ypipe (not shown) were used to convey the exhaust gases from the enginemanifold 34, there would be only one catalytic converter 36 and onemuffler 44 in the vehicle 28, as is known in the art. The exhaust gasesflow through entrance pipe 38 which is located in an inlet tube 40 atone end 42 of a muffler 44. The exhaust gases then flow through muffler44 and exit through an outlet tube 46 into an exit pipe 48. Frequently,exit pipe 48 is located at an end 50 of the muffler 44 opposite end 42.The exhaust gases then travel through a tailpipe 52 to a rear end 54 ofvehicle 28 and exit out of vehicle 28.

Yet another prior art exhaust system disclosed in U.S. Pat. No.3,070,187 to Deremer, the disclosure of which is hereby incorporated byreference, uses a muffler having an inlet tube 40 and an outlet tube 46disposed on the same end of the muffler 44.

As best shown in FIGS. 1, 2, and 6, the side exhaust pipe retrofit 22 ofthe present invention for use in vehicle 28, having two mufflers 44,preferably includes a pair of exhaust gas exit pipes 56 (also, "exitpipe(s) 56"), one per muffler 44. (If vehicle 28 only has one muffler44, then only one exit pipe 56 is used for the side exhaust piperetrofit 22.) In the side exhaust pipe retrofit 22 of the presentinvention, the exhaust gases from an engine manifold 34 pass into a pairof catalytic converters 36. The exhaust gases then proceed into a pairof mufflers 44 via a pair of entrance pipes 38, with one entrance pipe38 per muffler 44. Entrance pipe 38 is located in an inlet tube 40 atone end 42 of muffler 44. The exhaust gases flow through each muffler 44and exit at an outlet tube 46 of muffler 44 into exit pipe 56.

In the present invention, in muffler 44, preferably inlet tube 40 andoutlet tube 46 of muffler 44 are at a same end 42 of muffler 44, thusentrance pipe 38 and exit pipe 56 for exhaust gas are preferably both atthe same end 42, as best shown in FIGS. 1, 2, 19B and 20. However thepresent invention may be used with a muffler 44 having inlet tube 40 andoutlet tube 46 at opposite ends 42, 50 of muffler 44, wherein entrancepipe 38 and exit pipe 56 are at opposite ends 42, 50 of the muffler 44,as shown in FIG. 6. Whether the muffler 44 has the inlet tube 40 and theoutlet tube 46 at the opposite ends 42, 50 of the muffler 44 or at thesame end 42 of the muffler, in the side exhaust pipe retrofit 22 of thepresent invention, each of the exit pipes 56, has three exit pipeportions, a first portion 58, a second portion 60 and a third portion62.

As best shown in FIGS. 1, 2, 4A-4D", 5A-5B, and 6, first portion 58,herein throughout, also "forward extension" 58, has a pair of firstportion ends 58A and 58B and a first portion pipe body 58C extendingbetween ends 58A, 58B. The pipe body 58C also has an outside wall 58D,an opposite inside wall 58E and an inside diameter 58F. The firstportion 58 is suitably dimensioned to extend from an outlet tube 46 ofmuffler 44 to a position behind a front wheel 61 and adjacent to atransmission 63 of a typical rear wheel drive vehicle 28. The firstportion 58 extends from an end of muffler 44 forward to a front end 33of the vehicle 28 and transports the hot exhaust gases out of muffler 44forward to front end 33 of vehicle 28, hence the alternate term, forwardextension 58.

First portion end 58A is fastened to outlet tube 46 of muffler 44 with afastener, such as by clamping with a clamp 59 (hereinafter, also "firstclamp 59") or by welding first portion end 58A to the outlet tube 46with a weld, or by other ways known in the art of fastening. Clamp 59 ispreferably a commercially available clamp, having a U-bolt, a saddle foraccepting the U-bolt and a pair of fasteners for fastening the U-bolt tothe saddle, known as a flatback style clamp with a U-Bolt, commerciallyavailable as HEAVY DUTY EXHAUST CLAMP™ clamp from P.A.P. Corp. ofLivonia, Mich., U.S.A.

Pipe body 58C preferably has a plurality of mixing portions 64,preferably three to five mixing portions 64, most preferably three orfour mixing portions 64. Each mixing portion 64 of the plurality ofmixing portions 64 is configured to mix the exhaust gases, but not torestrict the exhaust gas flow through pipe body 58C. Each mixing portion64 allows an unrestricted exhaust gas flow through pipe body 58C.Applicant has discovered that the use of a plurality of mixing portions64 in pipe body 58C is sufficient to alter the speed of the exhaust gas,causing the exhaust gas to mix in a swirling fashion along the pipe body58C, such that a cooler portion of the exhaust gases flow to outsidewall 58D of the pipe body 58C.

Applicant has discovered the mixing portions 64 may be configured atleast two ways, as shown in a first embodiment and a second embodimentof the first portion 58 of the present invention. The first embodimentuses multiple bends for mixing portions 64 and the second embodimentuses internal mixing fins for mixing portions 64.

The first embodiment of the first portion 58 is shown in FIGS. 1, 4A-4D"where the first portion 58 is configured to have a plurality of veryshallow angled bends 65 in pipe body 58C. Each bend 65 corresponds to amixing portion 64 and has a bend angle 66 of approximately 10 degrees toapproximately 45 degrees. Each bend 65 is either "bent in" or "bentout". The term "bent out" means the bend 65 is bent toward an adjacentdoor 115 of vehicle 28 or toward the outside of the vehicle, e.g., awayfrom a center of the vehicle 28. The term "bent in" means the bend 65 isbent toward the center of the vehicle 28, e.g., away from the adjacentdoor 115 of the vehicle 28. Preferably none of the bends 65 exceeds abend angle 66 of approximately 45 degrees, plus or minus 5 degrees. Thenumber of degrees per bend angle 66 may vary by plus or minus 5 degrees.When the bend angles 66 of the "in" and "out" bends are summed the neteffect is to cancel, e.g., to approximate zero degrees plus or minus 5degrees. As shown in end views in FIGS. 4B', 4C", and 4D", the mixingportions 64, bends 65, are not orientated up or down, but just in orout.

Preferably there are three to five bends 65 in first portion 58 of pipebody 58C which are separated from each other by at least six inches, butnot more than eighteen inches. Most preferably the bends 65 are not morethan 12 inches apart. The placement of the bends 65 is important toachieve the cooling of the exhaust gases. The aforementioned spacingadvantageously maximizes the cooling of the exhaust gases as they swirlalong portions of the pipe body 58C from mixing portion 64, e.g., bend65 to mixing portion 64, e.g., bend 65.

Most preferably the first portion 58 has four mixing portions 64, e.g.,bends 65A, 65B, 65C and 65D, as shown in FIGS. 1, 4A, 4B, 6 and 20. Bend65A is the first bend; 65B is the second bend; 65C is the third bend;and 65D is the fourth bend.

The actual angulation and spacing of each of the bends 65 depends uponthe vehicle 28 (e.g., the specific automobile or truck or motorcycle)for which the retrofit is being made. For the use with the vehicle 28shown in FIG. 1, a 1990 Mustang GT automobile, most preferably the bendangle 66 for the bend 65A is approximately 10 degrees bent out; the bendangle 66 for bend 65B is approximately 15 degrees bent in; the bendangle 66 for bend 65C is approximately 35 degrees bent in; and the bendangle 66 for bend 65D is approximately 45 degrees bent out. These bendangles are best shown in FIG. 4A. For the aforementioned vehicle, thefirst of the multiple bends 65A is disposed slightly ahead of end 42 ofmuffler 44, e.g., within approximately 4 inches to 6 inches of themuffler inlet tube 40 of vehicle 28 and from end 58A. The first bend 65Astarts mixing the hot exhaust gas and cooling it. The next bend 65B ispreferably spaced approximately fifteen inches from the first bend 65A.Bends 65C and 65D are made to clear the catalytic converter 36. Bend 65Cis spaced approximately 6 inches from bend 65B. Bend 65D is spacedpreferably 10 inches from bend 65C. The spacing from bend 65D to end 58Bis approximately 8 inches.

As best shown in FIGS. 4C, 4C' and 4C", an alternate aspect of the firstembodiment of first portion 58 has three mixing portions 64 having bends65A, 658 and 65C. For the aforementioned vehicle 28, preferably bend 65Ais within about 9 inches of the muffler inlet tube 40 and about 9 inchesfrom end 58A and bend 65A is bent at a bend angle 66 of approximately 10degrees bent out. Preferably bend angle 65B is spaced approximately 9inches from bend angle 65A and bend angle 65B is bent at a bend angle 66of approximately 20 degrees bent in. Preferably bend 65C is spacedapproximately 9 inches from bend 65B; bend 65C is bent at a bend angle66 of approximately 10 degrees bent out and bend 65C is spaced about 7inches from end 58B.

As best shown in FIGS. 4D, 4D' and 4D", yet another alternate aspect ofthe first embodiment of first portion 58 has five mixing portions 64,having bends 65A, 65B, 65C, 65D and 65E. The fifth bend is 65E. For theaforementioned vehicle 28, the first of the multiple bends 65A isdisposed slightly ahead of end 42 of muffler 44, e.g., withinapproximately 4 inches to 6 inches of the muffler inlet tube 40 ofvehicle 28 and from end 58A. The next bend 65B is preferably spacedapproximately 6 inches from the first bend 65A. Bend 65C is spacedapproximately 9 inches from bend 65B. Bend 65D is spaced preferably 6inches from bend 65C and bend 65E is spaced approximately 10 inches frombend 65D and approximately 6 inches from end 58B. The bend angles 66 arepreferably given as follows: at bend 65A, the bend angle 66 is 20degrees bent out; at bend 65B, the bend angle 66 is 10 degrees bent in;at bend 65C, the bend angle 66 is approximately 15 degrees bent in; thebend angle 66 for bend 65D is approximately 35 degrees bent in; and thebend angle 66 for bend 65E is approximately 45 degrees bent out.

The second embodiment of first portion 58, best shown in FIGS. 2, 5A-5D,and 19B is configured with a plurality of internal mixing fins 67disposed inside first portion 58 to mix the hot exhaust gases, but notto restrict the gas flow. The internal mixing fins 67 are the mixingportions 64 in the second embodiment. The internal mixing fins 67 arespaced and positioned within first portion 58 at locations on the pipeinside wall 58E such that the speed of the exhaust gases is altered,causing the exhaust gas to mix in a swirling fashion along the pipe body58C, with the direction of the swirling being changed as the exhaustgases encounter each of the internal mixing fins. It is believed thatthe swirling or vortex of exhaust gases forces the cooler exhaust gasesto the inside wall 58E of the first portion and the hotter exhaust gasto an inside of the pipe body 58C.

In the second embodiment, the first portion 58 is preferably made of aplurality of interconnectable segments 68, each segment having aninternal mixing fin 67. Alternatively, the first portion is made of asingle straight (nonbent) tubular member of uniform inner diameter,e.g., a pipe, having a plurality of internal mixing fins, as describedthroughout herein, disposed in the pipe, with the internal mixing finsin a spacing and an orientation with respect to each other as disclosedherein for the aspects of the present invention using interconnectablesegments 68. The internal cooling fins are preferably separated at leastapproximately 6 inches apart, but not greater than 12 inches apart.Preferably 3 to 5 internal mixing fins are used in first portion 58.

As shown in FIGS. 5A and 5B, each segment 68 is tubular having a segmentfirst end 70, a segment body portion 71, a segment receiving portion 73,and a segment second end 72. Extending through the segment body portion71, segment first end 70 has a segment first end inner diameter 74, asegment first end outer diameter 76 and a segment first end inner wall78. Segment second end 72 has a segment second end inner diameter 80 anda segment second end inside wall 82 extending through the segmentreceiving portion 73. The segment body portion 71 adjoins the segmentreceiving portion 73. The segment first end outer diameter 76 of aparticular segment 68, e.g., a first segment, is suitably dimensioned tofit within the segment second end inner diameter 80 of the segmentreceiving portion 73 of another segment 68, e.g., a second segment, andto be limited in travel within segment receiving portion 73 of thesecond segment by the segment first end inner diameter 74 of the segmentbody portion 71 of the other (second) segment 68.

Preferably, one internal mixing fin 67 is disposed in each segment firstend inner wall 78 and spaced from the segment first end 70. Eachinternal mixing fin 67 is planar having four sides 84A, 84B, 84C and 84Dand a thickness 84E. Sides 84A and 84C are parallel to each other andperpendicular to side 84B. Side 84D is opposite side 84B and is suitablycurved to fit within a portion of the segment first end inner wall 78.The curved side 84D is fastened to the segment first end inner wall 80by welding with a weld 84F, soldering or using another suitable joiningmethod, having curved side 84D oriented perpendicular to the segmentfirst end inner wall 78 and angled with respect to the segment first end70 at an angle 85A. The degree of angling of curved side 84D withrespect to the segment first end is at an angle sufficient to cause aspinning or swirling of the exhaust gas as it passes around the fin 67.Preferably curved side 84D is angled at an orientation of either 45degrees or 135 degrees from the segment first end 70, as shown in FIG.5C. In addition, side 84A of internal mixing fin 67 is spaced fromsegment first end 70 forming a gap portion 86A. Side 84C is spaced fromthe segment first end inner wall 78 forming a gap portion 86B. The gapportions 86A, 86B are sufficiently dimensioned to allow the exhaustgases an unrestricted flow around the internal mixing fin 67, providinga mixing of the exhaust gases. The segments 68 are oriented having theinternal mixing fins 67 alternate in position along pipe body 58C withadjacent pairs of internal mixing fins 67 having their respective sides84B parallel to each other in opposite orientations, thereby providing aspinning or swirling of the exhaust gases in counter directions as theexhaust gases pass around each of the adjacent fins 67.

The segments 68 are interconnected by inserting a segment first end 70of one segment into a segment receiving portion 73 of another segment68, orienting the internal mixing fins as described above, until alldesired segments are interconnected. The segments 68 of first portion 58are welded to each other with a weld 85 or are fastened with clamps 59to maintain a linear overall geometry. As best shown in FIGS. 5B and 5D,the resulting first portion 58 of the second embodiment is a "straight"pipe having a generally uniform inside diameter 58F generally equal tothe segment first end inner diameter 74.

The second embodiment of first portion 58 is best illustrated in FIGS.2, 5A-5D and 19B, where first portion 58 of exit pipe 56 is comprised ofthree segments 68A, 68B, 68C, providing a total assembled length ofapproximately 31.5 inches from end 58A to end 58B for a Mustang 1990 GTvehicle 28. Each segment 68A, 688, 68C is preferably 12 inches long fromsegment first end 70 to segment second end 72, with segment body portion71 approximately 10 inches long and segment receiving portion 73approximately 2 inches long. The segment first end inner diameter 74 ispreferably approximately 2 and 3/8 inches. The segment first end outerdiameter 76 is slightly less than approximately 2.5 inches. The segmentsecond end inner diameter is approximately 2.5 inches to receive thesegment first end 70. For this sized segment 68A, 68B, 68C an internalmixing fin 67 is suitably approximately 2 inches long by approximately0.75 inches wide by approximately 1/8 inch thick. The segments 68A, 68B,68C are made of metal, preferably steel piping and the internal mixingfins are made of metal, preferably steel plate. As shown in FIGS. 5B and5D, two of the segments 68A, 68C are constructed identically withidentical placement of the internal mixing fins, where the internalmixing fin 67 is positioned in each at approximately 135 degrees fromthe segment first end 70, having side 84A spaced from the end byapproximately a 1/8 inch gap 86A, having side 84C spaced from segmentfirst end inner wall 78 by approximately 1/8 inch gap 86B and havingside 84D welded to segment first end inner wall 78 so that the fin 67 isperpendicular to the segment first end inner wall 78. As shown in FIGS.5B and 5C, the third segment 68B is constructed identically to segments68A, 68B and the same dimensioned internal mixing fin 67, but with theinternal mixing fin 67 positioned at approximately 45 degrees from thesegment first end 70, having side 84A spaced from the end 70 byapproximately a 1/8 inch gap 86A, having side 84C spaced from segmentfirst end inner wall 78 by approximately 1/8 inch gap 86B and havingside 84D welded to segment first end inner wall 78 so that the fin 67 isperpendicular to the segment first end inner wall 78. As is appreciatedby those in the art, the physical dimensions of the segments 68 andinternal mixing fins 67 may be varied according to the specific model ofvehicle 28.

In use, the segments 68A, 68B, 68C are oriented so that the internalcooling fins create a counter swirling or spinning of the exhaust gasesat each internal mixing fin 67, advantageously causing the coolerexhaust gases to flow to the outside wall 58D of the pipe body 58C. Asshown in FIG. 5D, the segments 68A, 68B, 68C are oriented so that theinternal mixing fins 67 of segments 68A and 68B and the internal mixingfins of segments 68B and 68 have their respective sides 84B in parallelto each other in opposite orientations as viewed from end 58A of firstportion 58. To do this, segment 68B is rotated 135 degreescounterclockwise to segment 68A. As shown in FIGS. 5B and 5D, the fins67 in segments 68A and 68C are oriented parallel to each other. Thus thefin 67 in segment 68A is oriented with side 84D spaced from and oppositeside 84D of the fin 67 in segment 68B causing the exhaust gases to swirlin a clockwise direction after fin 67 in segment 68A, then to swirl in acounter clockwise direction after passing around fin 67 in segment 68B.Since the fin 67 in segment 68C is oriented with side 84D spaced fromand opposite side 84D of fin 67 in segment, as the exhaust gases passaround the fin 67 in the third segment 68C, the exhaust gases changedirection again swirling in a clockwise direction, advantageously mixingand cooling the exhaust gases.

Other aspects of the second embodiment include the use of additionalsegments 68, for example, a fourth segment, or a fourth segment and afifth segment may be added to a third segment 68C, wherein eachadditional segment 68 segment has a internal mixing fin 67 therein whichis oriented as previously described herein to achieve the alternateswirling of the exhaust gases. The additional segments 68 and internalmixing fins 67 are constructed as previously described herein with thelength of the segments adjusted appropriately to account for the totallength from end 58A to end 58B of first portion 58 for the specificvehicle 28.

Either embodiment of first portion 58 may be modified in yet another wayto accommodate a vehicle 28 where inlet tube 40 and outlet tube 46 areat opposite ends 42, 50 of muffler 44. In this additional aspect of thepresent invention, either embodiment of first portion 58 has at anadditional "J"-shaped portion 87 disposed before the first mixingportion 64, e.g., first multiple bend 65A or first internal cooling fin67 in a first segment 68A. The "J"-shaped portion 87 has an end 87Awhich is connected to the muffler outlet tube 46, a bend 87B and aforward directed portion 87C, extending between bend portion 87B and thefirst mixing portion 64. Portion 87C is "forward" directed to end 42 ofmuffler 44 and toward front end 33 of vehicle 28. Hot exhaust gases aretransported through outlet tube 46 of muffler 44 into first portion 58of exit pipe 56, e.g., moving through end 87A around bend 87B intoforward directed portion 87C of pipe body 58C then traveling throughmixing portions 64 where the exhaust gas is mixed and cooled aspreviously described. Additional cooling of exhaust gas is achieved inforward directed portion 87C. This aspect of the present invention isillustrated in FIG. 6, where "J"-shaped portion 87 is disposed beforefirst mixing portion 64, first bend 65A. "J"-shaped portion 87 isconstructed as unitary with the first mixing portion, e.g., unitary withfirst segment 68A, or unitary and disposed before the first bend 65A.The term "constructed as unitary" or "unitary" means that the respectiveportions are not separate from one another. Alternatively, the "J"shaped portion is constructed as a separate member and is joined to anend of the first portion near the first mixing portion of the exit pipe.The joining is done by clamping with a clamp 59, preferably anaforementioned flatback style clamp with a U-Bolt (which has a saddle, aU-bolt and fasteners) or by welding with a weld or by soldering withsolder, or in other ways known in the art of fastening. This is bestshown in FIG. 6, where the joining is done with a clamp 59.

In any of the aforemention embodiments and aspects of first portion 58of exit pipe 56, as described herein throughout and also shown in FIGS.1, 2, 6, 19B and 20, the second portion 60 of exit pipe 56 is generally"L" shaped having a base 90 and an arm 92 extending from base 90 atapproximately 90 degrees to base 90. Preferably the 90 degree angulationis in a sweeping curvature to promote freer exhaust gas flow. Base 90has base end 91. Arm 92 is dimensioned to extend laterally across anunderbody 32 of vehicle 28 to near an interior 94 of a side 96 of thevehicle 28. Arm 92 has arm end 93. Base end 91 is preferably flaredhaving an inner diameter which is suitably dimensioned for matingengagement with end 58B of first portion 58. Base end 91 of base 90 isfastened, e.g., joined, to end 58B of first portion 58 of exit pipe 56with a fastener, such as by clamping with a clamp 59, preferably anaforementioned flatback style clamp with a U-Bolt (which has a saddle, aU-bolt and fasteners), or by welding with a weld, or by other ways knownin the art of fastening.

Most preferably base end 91 of base 90 is welded to end 58B with a weld98. At a point of fastening 100 (preferably either where clamp 59, weld98, or the like, is located) of the first portion 58 to the secondportion 60, a mounting strap 102 is used to fasten the assembled, e.g.,fastened, first portion 58 and the second portion 60 to an H pipe 31 (ora Y pipe for a vehicle having only one muffler) of the vehicle 28.

Mounting strap 102, as best shown in FIGS. 4A and 5A, is a shallow "U"shaped metal member. Preferably mounting strap 102 is made ofapproximately 1.25 inch wide and 3/16 inch thick strap ironapproximately 9.5 inches across and approximately 2.75 inches deep.Mounting strap 102 is welded to the H pipe 31 (or the Y pipe, for thevehicle having only one muffler) of vehicle 28 and to point of fastening100.

The fastening of the exit pipe 56 to the H pipe 31 (or the Y pipe) ofvehicle 28 with mounting strap 102 advantageously allows the exit pipe56 to move with the vehicle's engine. This is especially advantageousbecause it provides for the exhaust system to float, e.g., suspend, as asingle unit. If the mounting strap 102 is not fastened in the mannerdescribed, the vehicle's exhaust system experiences excessive vibrationas the vehicle 28 is operated and the mounting strap 102 breaks off dueto the mechanical stress caused by the vibrations.

The third portion 62 (hereinthroughout, also "side exhaust pipe 62") ofexit pipe 56 has a backwards "S" shape with opposing curved ends 106,108 and an elongate exhaust pipe middle part 110 (herein also elongatemiddle part 110) extending between curved ends 106, 108. Curved end 106is preferably more elongate than curved end 108 having a lateralextension portion 112 with an approximately 90 degree bend betweenelongate middle part 110 and lateral extension portion 112. Curved end106 has a distal portion 107 suitably dimensioned to engage in a matingfashion with arm end 93 of arm 92 of second portion 60. Arm end 93 ofarm 92 of second portion 60 and distal portion 107 of third portion 62are fastened with a fastener, preferably by a clamp 59, preferably anaforementioned flatback style clamp with a U-Bolt.

Curved end 108 is also bent approximately 90 degrees to elongate pipemiddle part 110 in a direction opposite to curved end 106. Curved end108 is preferably truncated and is dimensioned to be approximately flushwith an exterior side 114 of vehicle 28. The cooled exhaust gas exitsfrom vehicle 28 out of curved end 108.

Elongate middle part 110 of third portion 62 has a pipe outercircumference 116, a pipe outer radius of curvature 118, a pipe interior120, a pipe inside diameter 122 and a pipe length 124. There is nointernal muffler within third portion 62.

Side exhaust pipe 62 also has a shield 126 which is generally arc-shapedhaving an inner radius of curvature greater than pipe outer radius ofcurvature 118 and a shield length 128 suitably shorter than pipe length124. Shield 126 has apertures 130 for accepting fasteners 132, suitablyscrews and bolts. The shield 126 of side exhaust pipe 62 may beperforated by a plurality of ventillation holes 134 as shown in FIGS. 1,2, 4A, 4B, 5A, 6, 19B, 20 or may be without ventilation holes 134, e.g.,imperforate of ventilation holes 134, as shown in FIG. 7. As shown inFIGS. 1, 2, 6, 8A, 8B, 8C, 19B, and 20, shield 126 is fastened to middlepart 110 with a pair of clamps 136 and is spaced from the pipe outercircumference 116. Shield 126 extends partially around the pipe outercircumference 116. Shield 126 extends partially along the pipe length124 of elongate middle part 110.

As best shown in FIGS. 4A, 5A, 8B, 8C and 8D, clamps 136 are preferablyof a commercially available flatback style with a "U" bolt, also knownas, a clamp having U-bolt and saddle construction, similar to clamp 59but with the addition of "ears". Preferably, each clamp 136 has a U-bolt136A, a saddle 136B for accepting the U-bolt 136A and fastening hardware136C, e.g., bolts for fastening the U-bolt 136A to the saddle 1368.U-Bolt 136A is suitably dimensioned to extend around pipe circumference116 and is engaged in locking fashion with saddle 136B, using thefastening hardware 136C. Each saddle 136B has a pair of ears 136Dextending from the saddle 136B for accepting fasteners 132 of shield126.

Clamps 136 are fastened to the vehicle 28 using rubber grommets 140,commercially available as ISOMOUNT™ grommets from P.A.P. Corp. ofLivonia, Mich., U.S.A. A grommet accepting opening 141 is drilled intothe exterior 114 of a side 96 of the vehicle 28, below a door 115.Opening 141 is drilled through the side 96 of the vehicle 28 for eachgrommet 140. The rubber grommets 140 are inserted into the grommetaccepting openings 141, as shown in FIGS. 8B-8D. The U-Bolt threadsthrough the rubber grommets 140 being fastened with fastening hardware136C. The fastening of the clamps 136 to the vehicle 28 is best shown inFIG. 8B. The rubber grommets 140 isolate the vibrating metal parts ofthe saddle 136B and U-bolt 136A, holding the side exhaust pipe 62 fromthe side 96 of the vehicle 28.

Elongate middle part 110 of side exhaust pipe 62 extends, along theexterior side 114 of one side 96 of the vehicle 28, from the front end33 to the rear end 54 of vehicle 28. As shown in FIG. 8A, the overallappearance of the elongate side exhaust pipe 62 is most preferably thatof a straight pipe from just behind the front wheel 61 to a rear wheelwell 142 of vehicle 28 below the door 115 of the vehicle 28.

The exit pipe 56 is made of metal piping. First portion 58 (including"J" shaped portion 87, if present) and second portion 60 are preferablysteel. Third portion 62, including shield 126, are preferably chromeplated metal.

In yet another embodiment of the side exhaust pipe retrofit 22, thesecond and third portions 60, 62 are constructed as unitary for aparticular model of vehicle. In yet another embodiment of the sideexhaust pipe retrofit 22, the first and second portions 58, 60 areconstructed as unitary for a particular model of vehicle. In still yetanother embodiment of the side exhaust pipe retrofit 22, the first,second and third portions 58, 60, 62 are constructed as unitary for aparticular model of vehicle. The term "constructed as unitary" meansthat the respective portions 60, 62 or 64 are not separate from oneanother but are continuous with each other.

Advantageously, the plurality of mixing portions 64, the laterallyextended arm 90, the lateral extension portion 112 of curved end 106 andextended length of the elongate middle part 110 of side exhaust pipe 62of exit pipe 56 allow the exhaust gases exiting from vehicle 28 to coolsignificantly compared to the prior art exhaust systems 30. This is bestdemonstrated in Example 8, which will be discussed later. As best shownin FIG. 8A, the positioning of the elongate middle part 112 of elongateside exhaust pipe 62 along exterior side 114 of vehicle 28 also puts theexhaust sound along the side 96 of the vehicle 28 where a driver of thevehicle 28 can best appreciate it, as well as giving the aestheticallybeautiful appearance of a chrome coated side exhaust pipe mounted on theexterior side 114 of vehicle 28 just below the door 115 of the vehicle28.

The exhaust gas cooling system 20 of the side exhaust pipe retrofit 22is used in combination with a cooling fin system retrofit 24 used on anobject 204 of the exhaust gas system to be cooled. The cooling finsystem retrofit 24 may be used without using the side exhaust piperetrofit 22. The side exhaust pipe retrofit 22 may be used without thecooling fin retrofit 24.

As best shown in FIGS. 1, 2, 6, 9-15C and 19A, the cooling fin systemretrofit 24 of the present invention includes one or more adjustableclamps 200 and one or more cooling fin 202. One or more cooling fins 202are mounted on one or more adjustable clamp(s) 200. Each adjustableclamp 200 has an object encompassing portion 203 and a locking portion205. Object encompassing portion 203 is suitably dimensioned forfastening snugly around the object 204, e.g., muffler 44, H pipe 31 or Ypipe, inlet tube 40 and outlet tube 46 of the muffler 44, catalyticconverter 36 or other engine part, of the exhaust gas system to becooled. The number of adjustable clamps 200 used depends on a size of aperimeter 206 of the object 204 to which the cooling fin system retrofit24 is to be attached and a size of the object encompassing portion 203of adjustable clamp 200.

Adjustable clamp 200 is preferably a standard stainless steel heavy dutyscrew clamp 207, often called a hose clamp, which is commerciallyavailable at automotive supply stores. Each of the screw clamps 207 hasan object encompassing portion 203, preferably a belt-like portion 208,hereinafter, "belt 208", and a locking portion 205. Belt 208 has aperforated track 212, a belt thickness 214, a belt length 215 and a beltwidth 216. Locking portion 205 of screw clamp 207 is preferably anadjustment screw 210 which moves along perforated track 212 in the belt208. Adjustment screw 210 is easily moved using a screwdriver.

In FIGS. 9 and 12, an example cooling fin system retrofit 24, using onlyfive cooling fins 202, is shown attached to muffler 44 using twoadjustable screw clamps 207 joined to each other. The two screw clamps207 are joined in the conventional manner by moving adjustment screw 210on one adjustable screw clamp 207 along the perforated track 212 of thebelt 208 of the other. By suitable adjustment of the adjustment screws210, the belt lengths 215 are adjusted in size to fit around perimeter206 of the object 204, in FIGS. 9 and 12, muffler 44.

Alternatively, a single adjustable screw clamp 207 having a belt length215 sufficiently dimensioned to fasten snugly around perimeter 206 ofthe object 204 is used. Yet, alternatively, more than two screw clamps207 may be joined each to each other to be fastened snugly aroundperimeter 206 of the object 204 to be cooled. Choice of the number andbelt size of screw clamps 207 used are within the discretion of theuser, since the choice may be determined by local availability of thescrew clamp 207, the cost, and the convenience of not having to orderspecial sized screw clamps 207.

As best shown in FIGS. 9-15C, each cooling fin 202 is preferably made ofa metal, most preferably a 20 gauge galvanized sheet metal. Each coolingfin 202 has a base 202A with a pair of upright arms 202B, 202C extendingfrom the base 202A. One of the arms 202B has a lip 202D depending fromit. The arms 202B, 202C are suitably dimensioned so that a portion ofarm 202C of one cooling fin 202 may be engaged with lip 202D of arm 202Bof another cooling fin 202, thus joining one cooling fin 202 to anothercooling fin 202. Each cooling fin 202 has a plurality of clamp receivingapertures 246 penetrating the base 202A and the upstanding arms 202B,202C. Clamp receiving apertures 246 are dimensioned to accept the objectencompassing portion 203 of adjustable clamp 200 and to have an airclearance portion 253 to permit air flow around the object 204 which isbeing cooled. Each cooling fin 202 has one or more sets 249 of spacedaligned pairs 247 of clamp receiving apertures 246. The number of sets249 of aligned pairs 247 of clamp receiving apertures 246 on a coolingfin 202 depends on dimensions of the base 202A of the cooling fin 202,dimensions of the clamp receiving apertures 246 and a length dimensionof the object 204 to be cooled.

The base 202A of cooling fin 202 may have any geometric shape, such as,but not limited to, a rectangular shape, a square shape, a triangularshape, a polygonal shape or a curved shape, provided that the base 202Aof the cooling fin 202 that is attached is at least partiallycomplimentary in shape so that portions of the two fin bases 202A willabut one another. Cooling fin 202 has a length extending from an end ofthe base 202A to an opposite end of the base 202A.

The upright arms 202B, 202C may have any geometric shape, such as, butnot limited to, a rectangular shape, a square shape, a triangular shape,a polygonal shape or a curved shape, and portions of the upright armsmay 202B, 202C be removed.

In a preferred embodiment, shown in FIGS. 9-14, cooling fin 202 is a "U"shaped channel 217 having a channel thickness 220 and base 202A.Preferably channel thickness 220 is the thickness of the sheet metalused, here most preferably 20 gauge. Base 202A is of a rectangular shapewith a channel base length 218 and a channel base width 219. Extendingfrom base 202A along the channel base length 218 is a pair of uprightarms 202B, 202C. Base 202A has a pair of opposite ends 222 spaced bychannel base length 218 and a pair of opposite sides 224 spaced bychannel base width 219. Upright arms 202B, 202C are generally parallelto each other and are spaced from each other by channel base width 219.Upright arms 202B, and 202C extend from opposite sides 224 and aregenerally perpendicular to base 202A.

Each upright arm 202B, 202C is preferably a generally rectangular shapehaving an upper edge 226A, 226B, respectively, and an opposite generallyparallel lower edge 228, an exterior surface 230 and an oppositeinterior surface 232. Lower edge 228 is preferably continuous withopposite side 224, and in the preferred embodiment is a fold line of thesheet metal forming a channel edge 233. Alternatively, lower edge 228 isjoined by welding, soldering or other joining methods to opposite side224 to form channel edge 233 of channel 217.

A portion 234 of upper edge 226A of upright arm 202B is folded againstexterior surface 230 and forming lip 202D and a fold edge 240. Uprightarm 202B has a channel arm height 242A from channel edge 233 to foldedge 240. Upright arm 202C has a channel arm height 242B from channeledge 233 to upper edge 226B. Preferably channel arm height 242A ishigher than channel arm height 242B by channel thickness 220.

Each cooling fin 202 has a plurality of clamp receiving apertures 246disposed in spaced aligned pairs 247 penetrating channel edges 233. Eachcooling fin 202 has one or more sets 249 of spaced aligned pairs 247 ofclamp receiving apertures 246. The number of sets 249 of aligned pairs247 of clamp receiving apertures 246 on a cooling fin 202 depends on thechannel base length 218 of the cooling fin 202, dimensions of the clampreceiving apertures 246 and the length dimension of the object 204 to becooled. Preferably there is one set 249 of aligned pairs 247 per every 4inches to 6 inches of channel base length 218 (or length of coolingfin). The cooling fin 202 preferably extends the length of the object204 to be cooled.

Each clamp receiving aperture 246 has an arm aperture portion 248adjoined to a base aperture portion 250. Arm aperture portion 248penetrates upright arms 202B, 202C; base aperture portion 250 penetratesbase 202A. Clamp receiving apertures 246 are preferably generallyrectangular in shape or elliptical in shape and are dimensioned toaccept object encompassing portion 203 of adjustable clamp 200, and mostpreferably dimensioned to accept belt thickness 214 and belt width 218of belt 208 of screw clamp 207. Between pairs of base aperture portions250 of aligned pairs 247 of clamp receiving apertures 246 is a baseportion 251. In use, object encompassing portion 203 of adjustable clamp200 is threaded through arm aperture portion 248 of cooling fin 202 andobject encompassing portion 203 of adjustable clamp 200 overlays baseportion 251.

Arm aperture portion 248 of clamp receiving aperture 246 is suitablydimensioned to have an air clearance portion 253 which allows air flowthrough the arm aperture portions 248 and around the object 204 beingcooled when the object encompassing portion 203 of adjustable clamp 200is engaged in clamp receiving apertures 246 of cooling fin 202 andmounted around perimeter 206 of object 204 to be cooled.

As best shown in FIGS. 12 and 13, a plurality of cooling fins 202 arefastened one to another by sliding upper edge 226B of upright arm 202Cunder lip 202D of upright arm 202B of another cooling fin 202. When aplurality of cooling fins 202 are selected to be assembled into thecooling fin system retrofit 24 of the present invention, the coolingfins 202 are adjoined to allow one or more sets 249 of aligned pairs 247of clamp receiving apertures 246 to form adjoining set of spaced alignedpairs 247 of clamp receiving apertures 246. This allows for arm apertureportions 248 to be aligned in adjoined cooling fins 202.

If only a single cooling fin 202 is used, or if a plurality of coolingfins 202 are used to assemble the cooling fin system retrofit 24, theobject encompassing portion 203 of adjustable clamp 200 is suitablythreaded through an adjoining set 249 of spaced aligned pairs 247 ofclamp receiving apertures 246 of cooling fin(s) 202, as shown in FIGS.1, 2, 6, 9, 12, and 19A.

In use, the user suitably selects the number of cooling fins 202 to beassembled together and placed on the adjustable clamp 200 to make thecooling fin system retrofit 24. Because different automotive objects 204differ in physical dimension, e.g. length, height, depth, and perimeter206, the spacing of individual cooling fins 202, the number of coolingfins 202 joined together, the channel base 202A (e.g., in the preferredembodiment, the channel base width 219 and the channel base length 218),the upright arms 202B, 202C (e.g., in the preferred embodiment, thechannel arm heights 242A, 242B), the number of sets 249 of aligned pairs247, and the spacing between sets 249 of aligned pairs 247 of clampreceiving apertures 246 are variable. Preferably the cooling fins 202will extend around the entire perimeter of the object to be cooled asshown in FIGS. 1, 2, and 6.

FIGS. 14 and 15A-15C show cooling fins 202 having different channel baselength 218 (or length of cooling fin), different numbers of sets 249 ofaligned pairs of clamp receiving apertures 246, different shape basesand different shape upright arms 202B, 202C. FIG. 14 shows two coolingfins 202 constructed like those in FIG. 10, having a rectangular shapebase 202A and rectangular shape upright arms 202B, 202C, but with eachcooling fin 202 having different channel base length 218 and differingnumbers of sets 249 of aligned pairs 247. FIG. 15A shows a cooling fin202 as in FIG. 10, but having portions of the upright arms 202B, 202Cremoved, thereby providing each upright arms 202B and 202C with aportion 202E having a partially curved shape. However the portion of theupright arm which is removed may be any shape as is understood by thoseskilled in the art. FIG. 15B shows a pair of cooling fins 202, eachcooling fin having a base 202A which is a triangular shape and eachhaving a pair of upright arms 202B, 202C, which are rectangular shape,constructed like the upright arms 202B, 202C of the cooling fin 202shown in FIG. 10. The view in FIG. 15B is a top view of a pair ofcooling fins 202, with the cooling fins 202 aligned, having apertures246 aligned, prior to engaging upright arm 202C of one cooling fin 202with lip 202D of the other cooling fin 202. FIG. 15C shows a cooling fin202 where base 202A is triangular shape and where each of the uprightarms 202B, 203C are triangular shape.

In any of the embodiments of the cooling fin 202 of the presentinvention, the number of pairs of clamp receiving apertures 246 percooling fin 202 is variable depending upon the base 202A and dimensionof the clamp receiving apertures 246. The dimensions of the clampreceiving apertures 246 are variable depending on the dimensions of theobject encompassing portion 203 of the adjustable clamp 200 used, theair clearance portion 253 and the length of the cooling fin.

The user can advantageously customize the cooling fin system retrofit24, to the object 204 of the vehicle 28 the user desires to cool, byestimating the removal of heat from the object 204 to be cooled with thecooling fins 202 of the present invention. Most advantageously, the userselects the number of cooling fins 202, and their location on theperimeter 206 of the object 204 to be cooled. The user simply calculatesthe estimated heat to be removed and thereby selects cooling fins 202 tomake this match. The user can accordingly select the number of coolingfins 202 and size of the cooling fins 202 needed. An estimated removalof heat from a single cooling fin 202 is estimated at 0.25 degreesFahrenheit per square inch of upright arm surface. A surface area (insquare inches) of each upright arm is multiplied by 0.25 degreesFahrenheit per square inch. Where two upright arms 202B, 202C areadjoined to each other, it is counted as one upright arm for theestimated removal of heat. An example of this calculation of estimatedheat removal for the cooling fin system retrofit 24 as shown in FIG. 9is provided in Example 2.

The cooling fins 202 can be made any size to cover the object 204, ofthe exhaust system of the vehicle 28 totally or partially. For example,the cooling fins 202 cover muffler 44 totally around the perimeter 206,as shown in FIGS. 1, 2, 6 and 19A, or partially on muffler top only, oron top, sides and bottom of muffler 44. As shown in FIG. 9, the coolingfins cover muffler 44 partially on the perimeter 206 of the muffler 44and extend a length of the muffler 44.

The present invention includes a cooling fin kit 300 as best shown inFIG. 16, a side exhaust pipe retrofit kit 400 as best shown in FIGS.17A-17D and an exhaust gas cooling system kit 500 as shown in FIGS.18A-18D.

Cooling fin kit 300 includes a plurality of cooling fins 202, aspreviously disclosed and shown in FIGS. 9-15, and FIGS. 1, 2, 6, 19A,the disclosures of which are hereby incorporated by reference. Each ofthe cooling fins 202 may be identically dimensioned as shown in FIG. 9or may be of differing dimensions, as shown in FIG. 14, or have portions202E of the upright arms 202B, 202C removed, as shown in FIG. 15A, ormay have different base shapes, as shown in FIGS. 15B and 15C, and/ordifferent upright arm 202B, 202C shapes, to allow the user to customizethe cooling of the object 204 of the exhaust system of the vehicle 28,the user desires to cool. Cooling fin 202, may have one set 249 ofaligned pairs 247 of clamp receiving apertures 246 per cooling fin 202or a plurality of sets 249 of aligned pairs 247 of clamp receivingapertures 246 per cooling fin 202. The cooling fin kit 300 also mayinclude one or more adjustable clamps 200 for use with the cooling fins202. The adjustable clamp 200 is as previously disclosedhereinthroughout, the disclosure of which is hereby incorporated byreference. Most preferably, adjustable clamp 200 is a screw clamp 207having a belt 208 with a perforated track 212 and a locking portion 205having an adjustment screw 210.

Side exhaust pipe retrofit kit 400 includes an exit pipe 56 having afirst portion 58, a second portion 60 and a third portion 62 (includingheat shield 126), as previously disclosed herein throughout out andshown in FIGS. 1, 2, 4A-4D", 5A-5D, 6-8, 19B and 20, the disclosures ofwhich are hereby incorporated by reference. FIGS. 17A and 17B show theside exhaust pipe retrofit kit having the first embodiment of the firstportion 58 of the exit pipe 56. FIGS. 17C and 17D show the side exhaustpipe retrofit kit having the second embodiment of the first portion 58of the exit pipe 56. The side exhaust pipe retrofit kit 400 may alsoinclude clamps 59, mounting strap(s) 102, as well as, heat shield 126,rubber grommets 140, clamps 136, and fasteners 132 as previouslydisclosed herein throughout, the disclosures of which are herebyincorporated by reference. Heat shield 126 is perforated by ventilationholes 134 or may not be perforated by ventilation holes 134. Yetalternatively, the side exhaust pipe retrofit kit 400 may also include amuffler 44. The muffler 44 includes an inlet tube 40 and an outlet tube46 disposed on a same end 42 of muffler 44 as shown in FIGS. 17A and17C. Alternatively, the muffler 44 includes an inlet tube 40 and anoutlet tube 46 disposed on opposite ends 42, 50 of muffler 44, as shownin FIGS. 17B, 17D. Either embodiment of muffler 44 is external to theexhaust gas exit pipe 56, e.g., the muffler 44 is not within the exitpipe 56, it is not an internal muffler. The kit may also include a "J"shaped portion 87 as shown in FIGS. 17B and 17D.

Exhaust system retrofit kit 500 includes the cooling fin kit 300 and theside exhaust pipe retrofit kit 400 which are previously disclosedherein, the disclosures of which are hereby incorporated by reference.FIGS. 18A and 18C show the exhaust system retrofit kit where the sideexhaust pipe retrofit kit has the first embodiment of the first portion58 of the exit pipe 56. FIGS. 18B and 18D show the exhaust systemretrofit kit where the side exhaust pipe retrofit kit has the secondembodiment of the first portion 58 of the exit pipe 56.

The cooling fin(s) 202 and adjustable clamp(s) 200 of cooling finretrofit kit 300 are assembled according to the disclosure hereinthroughout for assembling the cooling fins and attaching the coolingfin(s) 202 to the object 204 to be cooled with the adjustable clamp(s)200.

The exit pipe 56 of the side exhaust pipe retrofit kit 400 is assembledaccording to the disclosure herein throughout for assembling the exitpipe 56 and attaching it to the vehicle 28. Replacement of muffler 44 isknown by those skilled in the art.

The exhaust system retrofit kit 500 is assembled according to thedisclosure herein throughout for assembling the cooling fin retrofit kit300 and for assembling the side exhaust pipe retrofit kit 400.

The present invention is further explained by the following exampleswhich should not be construed by way of limiting the scope of thepresent invention.

EXAMPLE 1 Exhaust Exit Pipe and Side Exhaust Pipe Retrofit (MultipleBend First Portion)

A side exhaust pipe 56 and a side exhaust pipe retrofit 22 according tothe present invention were made and installed according to the followingmethods for use with a vehicle 28, a 1990 Mustang GT automobile, withoutground effects. This vehicle 28 had two mufflers 44, thus two exit pipes56 were made.

The pair of existing mufflers 44 and the pair of tail pipes 52 wereremoved prior to installation of the side exhaust system retrofit 22 onthe vehicle 28. A new pair of mufflers 44 having an inlet tube 40 and anoutlet tube 46 on the same end 42 of the muffler 44 were installed onthe vehicle 28 prior to the installation of the side exhaust piperetrofit 22 on the vehicle 28.

A pair of exit pipes 56 were made as herein throughout described for thefirst embodiment of first portion 58. The first portion 58 of each exitpipe 56 was made of an approximately 2.5 inch inside diameter,approximately 12 inch length of steel pipe. This pipe is commerciallysold under the trade name Marremont and is manufactured by ArvinProducts of 100 Westwood Place, Brentwood, Tenn., 37027, U.S.A. Thefirst portions 58 of each of the exit pipes 56 having multiple bendstherein is a mirror image of the other. The first portions 56 were madeidentically as described below, then one of them was rotated 180 degreesto the mirror image orientation.

Each steel pipe was bent at a bend angle of approximately 10 degreesbent out approximately 6 inches from one end 58A, forming a first bend65A, a first mixing portion. A second bend 65B was made at anapproximately 15-degree bend angle and bent in. Second bend 65B was madeapproximately 15 inches from bend 65A. A third bend 65C was made at abend angle of approximately 35 degrees and bent in. Third bend 65C wasmade approximately 6 inches from bend 65B. A fourth bend 65D was made ata bend angle of approximately 45 degrees and bent out. Bend 65D was madeapproximately 10 inches from bend 65C. The distance from end 56B to bend65D was approximately 6 inches.

The second portion 60 of exit pipe 56 was made of a commerciallyavailable 2.5 inch inner diameter steel pipe sold under the trade nameMarremont and manufactured by Arvin Products located at 100 WestwoodPlace, Brentwood, Tenn., 37027, U.S.A. (Other metal product tubingmaterial equivalent to the Marremont steel pipe may be used.) A lengthof pipe approximately 16 inches long was bent at approximately 90degrees creating an approximately 7-inch base 90 and an approximately7-inch arm 92.

The third portion 62 of exit pipe 56 was purchased as a DYNOMAX™performance exhaust system, model number 89300 from DYNOMAX PerformanceExhaust Company, of Racine, Wis., U.S.A. This exhaust system is chromecoated, e.g., chrome finished/chrome plated. It includes a backwards"S"-shaped exhaust pipe having curved ends 106, 108, an elongate middlepart 110 extending between curved ends, 106, 108, an internal muffler44' inserted within elongate middle part 110, a shield 126, a pair ofclamps 136 having a U-bolt 136A and saddle 136B design, including a pairof ears for mounting shield 98 to elongate middle part 110 of theDYNOMAX™ exhaust system, fasteners for fastening the U-bolt in thesaddle 136B and sheet metal screws and bolts (fasteners 132) forfastening the shield to the pair of clamps 136.

The curved end 106 was approximately 10 inches long; curved end 108 wasapproximately 10 inches long. The elongate middle part 110 wasapproximately 36 inches long. The DYNOMAX™ exhaust system internalmuffler 44' installed in the elongate middle part 110 was removed. Thepresent invention does not use an internal muffler 44' in the exit pipe56. The side exhaust pipe 62 was cleaned by honing out the interior witha common cylindrical hone. The ears of the clamps 136 of the DYNOMAX™exhaust system were modified and an approximately 1.5 inch byapproximately 1 inch rectangular piece of approximately 0.25 inch thicksheet metal plate was welded across the saddle 136B on each side to makea new pair of ears 136D.

Shield 126 was fastened to elongate middle part 110 of third portion 62with pair of clamps 136. The U-bolt 136A of each clamp 106 was engagedaround circumference of elongate middle part 110. Each U-bolt was thenengaged in the saddle 136B of the clamp 136. Shield 126 was attached toear 136D of each saddle 136B with one of the sheet metal screws.

The side exhaust pipe retrofit 22 was made by assembling each exit pipe56 and fastening one assembled exit pipe 56 to one of the pair ofmufflers 44 and to the undercarriage 32 of vehicle 28, then fasteningthe other assembled exit pipe 56 to the other of the pair of mufflers 44and to the undercarriage 32 of vehicle 28.

Each of the exit pipes 56 was assembled as follows. The end 58B of firstportion 58 adjacent bend 65D was joined, e.g., fastened, to base 90 ofsecond portion 60 by welding, creating point of fastening 100 with aweld 98. Arm 92 of second portion 60 was clamped to curved end 106 ofthird portion 62 with clamp 59. Clamp 59 was an HEAVY DUTY EXHAUSTCLAMP™ heavy duty flatback style clamp with U-Bolt, part number 08068,commercially available from P.A.P. Corp. Livonia, Mich., U.S.A. Thiscompleted the assembly of the exit pipe 56.

Each exit pipe 56 was then mounted onto the undercarriage 32 vehicle 28.One of each exit pipes 56 was mounted to one of the pair of mufflers 44of vehicle 28. End 58A of first portion 58 (end 58A was adjacent thefirst mixing portion) was clamped to outlet tube 40 of muffler 44 withanother aforementioned heavy duty flatback style clamp 59. Weld 98,e.g., the point of fastening 100 of the first portion 58 to the secondportion 60, was fastened to the H pipe 31 of the vehicle 28 withmounting strap 102. Rubber grommets 140 commercially available asISOMOUNT™ grommets from P.A.P. Corp. Livonia, Mich., U.S.A. were used toattach the third portion to the vehicle 28. Grommet accepting openings141 were drilled into the exterior 114 of a side 96 of the vehicle 28,below door 115 for each rubber grommet 140. A rubber grommet 140 wasinserted into each grommet accepting opening 141. The ends of the U-bolt136 were threaded through the rubber grommets 140 (each of which has anopening therethrough). Fastening hardware 136C were then fastened to theU-bolt 136B. The rubber grommets 140 isolated the vibrating metal partsof the saddle 136B and U-bolt 136A holding the side exhaust pipe 62 fromthe side 96 of the vehicle 28. The elongate middle part 110 of thirdportion 62 of exit pipe 48 extended on the exterior side 114 of the side96 of the vehicle 28 below the door 115 from just behind the front wheel61 to the rear wheel well 142.

The vehicle 28 was driven over 10,000 miles after installation underhighway driving conditions, e.g., speeds of 55 MPH and greater, withoutdiscoloration of the chrome plating in the third portion 62. Temperaturemeasurement were taken under specific driving conditions at specificlocations (shown in FIG. 20) on the vehicle using a pyrometer. Thetemperature measurements and driving conditions are discussed in Example8.

EXAMPLE 2 Cooling Fin and Cooling Fin System Retrofit

A cooling fin 202 and a cooling fin system retrofit 24 according to thepresent invention were made and installed on a vehicle according to thefollowing methods. A cooling fin 202 was made from a sheet of 20 gaugegalvanized steel having approximate dimensions of 3 and 3/8 inches by 13inches. This sheet was bent into a cooling fin 202 forming a "U" shapedchannel having a rectangular shaped base 202A with channel edges 233.The cooling fin 202 was shaped to have rectangular shaped upright arms202B, 202C. A lip 202D depended from upright arm 202B. The channel base202A had a channel base length 218 of approximately 13 inches, a channelbase width 219 of approximately 1 inches. Lip 202D was approximately 3/8inches, and channel arm heights were approximately 1 inch each. Threesets 249 of aligned pairs 247 of clamp receiving apertures 246 were cutinto the cooling fin 202 along channel edges 233. One set 249 of alignedpair 24 of clamp receiving apertures 246 centered on the channel baselength 218. Each of the other two sets 249 of aligned pairs 247 of clampreceiving apertures 246 were spaced approximately a quarter of thechannel base length 219 from each end 222 of base 202A. The clampreceiving apertures 246 were generally rectangular shaped with curvedcorners. Each clamp receiving aperture 246 was approximately 0.25 incheshigh by approximately 0.25 inches wide by approximately 1 inch long. Airclearance portion 253 was approximately 1 inch long by approximately0.25 inches. Twenty-two identically dimensioned cooling fins 202 wereconstructed for use around a muffler 44. This permitted the cooling finsto cover the perimeter 206 of the muffler 44. The cooling fins 202extended the length of the muffler 44.

The estimated removal of heat from a single cooling fin with theaforementioned dimensions was estimated at 6.5 degrees Fahrenheit. Thisestimate is based on the surface area (in square inches) of each uprightarm multiplied by 0.25 degrees Fahrenheit per square inch. For a singlecooling fin with two upright arms made according to the aforementioneddimensions, this is approximately 2×13 square inches×0.25 degreesFahrenheit per square inch (the calculation is uncorrected for the airclearance portion in the upright arms 202B, 202C.

For the cooling fin system retrofit 24 illustrated in FIG. 9 where fivecooling fins 202 (having the aforementioned dimensions) are adjoined,the estimated heat removal is approximately 19.5 degrees Fahrenheit (6upright arms multiplied by approximately 13 square inch surface area perupright arm multiplied by 0.25 degrees per square inch of surfacearea--where two upright arms are adjoined to each other, it is countedas one upright arm for the estimated removal of heat).

Two standard commercially available stainless steel heavy dutyadjustable screw clamps 207, model number 56 (54-100 mm) having thetrade name IDEAL HOSE CLAMPS manufactured by Stant Corporation of St.Augustine, Fla., U.S.A. were used. Each screw clamp 207 had a belt 208which measured approximately 13.25 inches in length with a perforatedtrack 212 measuring approximately 6.75 inches in length. Belt 208 had abelt thickness 214 of approximately 0.5 mm and a belt width 116 ofapproximately 9/16 inches.

In use, the cooling fin system retrofit 24 for use on muffler 44 wasassembled in the following manner. The user selected twenty-twoidentically dimensioned cooling fins 202 made as previously describedherein this Example. This number of cooling fins was suitable to extendaround the perimeter 206 of the muffler 44. The cooling fins 202 wereadjoined one to another by sliding the edge 226B of arm 202C of onecooling fin 202 under the lip 202D of upright arm 202B of anothercooling fin 202 until all the selected cooling fins 202 were adjoined.When all the selected cooling fins 202 were adjoined, the sets 249 ofaligned pairs 247 of clamp receiving apertures 246 aligned formingadjoining sets 252 of spaced aligned pairs 247. Three adjustable clamps200 were used in the cooling fin system retrofit 24, since there werethree adjoining sets 252 of spaced aligned pairs 247 of clamp receivingapertures for the adjoined cooling fins 202. One adjustable clamp 200was threaded through one adjoined set 249 of clamp receiving apertures246 on the adjoined cooling fins 202.

Each of the three adjustable clamps 200 was made of two of theaforementioned screw clamps 207 fastened one to the other. The belt 208of one of the two screw clamps was threaded through arm apertureportions 248 of an adjoined set 249 of clamp receiving apertures 246 ofadjoined cooling fins 202.

The assembled cooling fin system retrofit 24 was fastened around aperimeter 206 of muffler 44 by adjusting the object encompassing portion203, e.g., belts 208, of the adjustable clamp 200 and then locking thelocking portion 205, e.g., adjustment screw 210, of the adjustable clamp200. This suitably fastened the cooling fins 202 around the perimeter206 of muffler 44.

EXAMPLE 3 Exhaust Gas Cooling System

An exhaust gas cooling system 20 of the present invention having a sideexhaust pipe retrofit 22 and a cooling fin system retrofit 24 was madeand installed according to the following methods for use with thevehicle of Example 1. The side exhaust pipe retrofit 22 was made andinstalled according to Example 1, the disclosure of which is herebyincorporated by reference. The cooling fin system retrofit 24 was madeand installed according to Example 2, the disclosure of which is herebyincorporated by reference, on the mufflers 44 of the vehicle of Example1.

Temperature measurement were taken under specific driving conditions atspecific locations (shown in FIG. 20) on the vehicle using a pyrometer.The temperature measurements and driving conditions are discussed inExample 8.

EXAMPLE 4 Cooling Fin and Cooling Fin System Retrofit

A cooling fin 202 and a cooling fin system retrofit 24 was made andinstalled according to Example 2, the disclosure of which is herebyincorporated by reference, for use around an existing muffler 44 in avehicle, a 1990 Mustang GT automobile with ground effects, as shown inFIG. 19A.

Temperature measurement were taken under specific driving conditions atspecific locations (shown in FIG. 19A) on the vehicle using a pyrometer.The temperature measurements and driving conditions are discussed inExample 8.

EXAMPLE 5 Exhaust Exit Pipe and Side Exhaust Pipe Retrofit (InternalMixing Fins First Portion)

A side exhaust pipe 56 and a side exhaust pipe retrofit 22 according tothe present invention were made and installed according to the followingmethods for use with the vehicle 28 of Example 4, a 1990 Mustang GTautomobile, with ground effects. This vehicle 28 had two mufflers 44,thus two exit pipes 56 were made.

The pair of existing mufflers 44 and the pair of tail pipes 52 wereremoved prior to installation of the side exhaust system retrofit 22 onthe vehicle 28. A new pair of mufflers 44 having an inlet tube 40 and anoutlet tube 46 on the same end 42 of the muffler 44 were installed onthe vehicle 28 prior to the installation of the side exhaust piperetrofit 22 on the vehicle 28.

A pair of exit pipes 56 were made as herein throughout described for thesecond embodiment of first portion 58. The first portion 58 of exit pipe56 was made of an approximately 36-inch length of steel pipe. This pipeis commercially sold under the trade name Marremont and is manufacturedby Arvin Products of Brentwood, Tenn. U.S.A. The steel pipe was cut intothree identical length segments, each an approximately 12 inch longsegment, for making three identically dimensioned segments 68A, 68B,68C. Thus each segment 68A, 68B, 68C was approximately 12 inches longfrom segment first end 70 to segment second end 72, with segment bodyportion 71 approximately 10 inches long and segment receiving portion 73approximately 2 inches long. The segment first end inner diameter 74 waspreferably approximately 2 and 3/8 inches. The segment first end outerdiameter 76 was slightly less than 2.5 inches. The segment second endforming the segment receiving portion 73 was enlarged in inner diameterto be approximately 2.5 inches and in outer diameter to be approximately2 and 11/16 inches. The enlarging was done by using a common pipeexpander in the conventional manner.

Three internal mixing fins 67 were constructed of steel plate, eachinternal mixing fin was approximately 2 inches long by approximately0.75 inches wide by approximately 1/8 inch thick. Sides 84A and 84C wereeach approximately 0.75 inches. Sides 86B and 86D were approximately 2inches each. Side 86D was curved and sides 84A, 84B and 84C werestraight. Sides 84A and 84C were generally perpendicular to side 84B.The curved side 86D was shaped to abut perpendicularly against thesegment first end inner wall 78 at a specified angulation to and spacedfrom the segment first end 70.

Two of the segments 68A, 68C were constructed with the internal mixingfin 67 identically positioned in each at approximately 135 degrees(specified angulation) from the segment first end 70, having side 84Aspaced from the end by approximately a 1/8 inch gap 86A, having side 84Cspaced from segment first end inner wall 78 by approximately 1/8 inchgap 86B and having side 84D welded with weld 84F to segment first endinner wall 78 so that the fin 67 was perpendicular to the segment firstend inner wall 78.

The third segment 68B was constructed with the internal mixing fin 67positioned at approximately 45 degrees (specified angulation) from thesegment first end 70, having side 84A spaced from the end byapproximately a 1/8 inch gap 86A, having side 84C spaced from segmentfirst end inner wall 78 by approximately 1/8 inch gap 86B and havingside 84D welded to segment first end inner wall 78 with weld 84F so thatthe fin 67 was perpendicular to the segment first end inner wall 78.

In use, the segments 68A, 68B, 68C were joined to each other so thatsegment second end inner diameter 80 received the segment first end 70.The segments 68A, 68B, 68C were oriented so that the internal mixingfins 67 of segments 68A and 68B and the internal mixing fins of segments68B and 68 had their respective sides 84B in parallel to each other inopposite orientations as viewed from end 58A of first portion 58. Thefins 67 in segments 68A and 68C were oriented parallel to each other.Thus the fin 67 in segment 68A was oriented with side 84D spaced fromand opposite side 84D of the fin 67 in segment 68B causing the exhaustgases to swirl in a clockwise direction after fin 67 in segment 68A,then to swirl in a counter clockwise direction after passing around fin67 in segment 68B. Since the fin 67 in segment 68C was oriented withside 84D spaced from and opposite side 84D of fin 67 in segment, afterthe exhaust gases passed around the fin 67 in the third segment 68C, theexhaust gases changed direction again swirling in a clockwise direction,advantageously mixing and cooling the exhaust gases. The fin 67 insegment 68A functioned as a first mixing portion 64.

The segments 68A, 688, and 68C, were assembled by welding segment 68A tosegment 68B which was welded to segment 68C with welds 85. When thethree segments 68A, 68B, 68C were assembled, the first portion 58 wasapproximately 31.5 inches long from end 58A to end 58B.

The second and third portions were made and assembled to the firstportion and to the vehicle as described in Example 1, which disclosureis incorporated by reference.

Temperature measurement were taken under specific driving conditions atspecific locations (shown in FIG. 19B) on the vehicle using a pyrometer.The temperature measurements and driving conditions are discussed inExample 8.

EXAMPLE 6 Cooling Fin and Cooling Fin System Retrofit

A cooling fin 202 and a cooling fin system retrofit 24 were made andinstalled according to Example 2, the disclosure of which is herebyincorporated by reference, on the new pair of mufflers 44 of the vehicle28 of Example 5, as shown in FIG. 2.

EXAMPLE 7 Exhaust Gas Cooling System

An exhaust gas cooling system 20 having a side exhaust pipe retrofit 22and a cooling fin system retrofit 24 was made and installed according tothe following methods for use with the vehicle of Example 5. The sideexhaust pipe retrofit 22 was made and installed according to Example 5,the disclosure of which is hereby incorporated by reference. The coolingfin system retrofit 24 was made and installed on the new pair ofmufflers 44 according to Example 6, the disclosure of which is herebyincorporated by reference. The exhaust gas cooling system retrofit isbest shown in FIG. 2.

Temperature measurement were taken under specific driving conditions atspecific locations (shown in FIG. 19B) on the vehicle using a pyrometer.The temperature measurements and driving conditions are discussed inExample 8.

EXAMPLE 8 Results of the Temperature Measurements

Temperature measurements were made on the exhaust gas system of a 1990Mustang GT automobile, with ground effects (Vehicle 1), and on a 1990Mustang GT automobile, without ground effects (Vehicle 2) under varyingtest conditions using a ISSPRO™ pyrometer, model number R624,commercially available from ISSPRO, of Portland, Oreg. The pyrometer wasinstalled according to an instruction sheet accompanying the device. Thetemperature was measured at locations on the vehicles as shown in FIGS.19A, 19B, 20 and 21. The test was conducted under the following testconditions for same vehicle operating condition:

Test Condition 1, Vehicle 1, as shown in FIG. 3 without the exhaust gascooling system of the present invention (no side exhaust pipe retrofit22 and no cooling fin system retrofit 24);

Test Condition 2, Vehicle 1, as shown in FIG. 19A, with only the coolingfin system retrofit 24 installed around the muffler 44 only, asdescribed in Example 4;

Test Condition 3, Vehicle 1, as shown in FIG. 19B, with only the sideexhaust pipe retrofit 22 installed as described in Example 5;

Test Condition 4, Vehicle 1, as shown in FIG. 2, with the exhaust gascooling system 20 as described in Example 7, e.g., both the cooling finsystem retrofit 24 installed around the muffler 44, as in Example 6 andwith the side exhaust pipe retrofit 22, installed as in Example 5;

Test Condition 5, Vehicle 2, with a DYNOMAX™ exhaust system installed onthe side of the vehicle as shown in FIG. 21. The DYNOMAX™ exhaust systemwas not modified. The internal muffler 44' was kept inside the elongatemiddle part of the DYNOMAX™ exhaust system. The exhaust gases from the Hpipe were directly diverted, using a flexible tubing (piping) 600, tothe DYNOMAX™ exhaust system which was mounted on the side of the vehiclebelow the door 115. This is not recommended as the original vehiclemufflers are not used. This type of conversion is frequently done byhobbyists to provide the look of the side exhaust pipe and thepleasurable sound of the engine near the driver;

Test condition 6, Vehicle 2, as shown in FIG. 20, with only the sideexhaust pipe retrofit 22 installed as described in Example 1;

Test Condition 7, Vehicle 2, as shown in FIG. 1, with the exhaust gascooling system 20 as described in Example 3, e.g., both the cooling finsystem retrofit 24 installed around the muffler 44, as in Example 2 andwith the side exhaust pipe retrofit 22, installed as in Example 1.

The temperature was measured at the following locations on the vehicles:

Location 1 (L1) was the engine manifold 34.

Location 2 (L2) was between the catalytic converter 36 and the muffler44.

Location 3 (L3) was behind the muffler outlet tube 46 and just beforethe axles in Vehicle 1, FIGS. 3 and 19A. Location 3 (L3) was on curvedend 106 of third portion 62, on Vehicle 1, FIG. 19B and in Vehicle 2,FIGS. 1, 2, and 20, and on a similar location on the DYNOMAX™ exhaustsystem in FIG. 21.

Location 4 (L4) was at the end of the tail pipe 52 or at the end 108 ofthe side exhaust pipe 62, depending upon the Test Condition.

Location 5 (L5) was on the shield 126 of the side exhaust pipe 62.

The vehicles 1, 2 were operated under identical driving conditions,e.g., vehicle operating conditions. For each Test Condition 1-7, therespective vehicle was driven at highway speeds of 55 to 65 M.P.H. for 1hour's time. The typical motor revolutions per minute (RPM) wasmaintained between 1750-2000 RPM. Temperature measurements were takenduring daylight driving condition. The temperature measurements wererecorded in degrees Fahrenheit and are within approximately plus orminus 20 degrees Fahrenheit. The temperature measurements are notcorrected for outdoor ambient temperature. The outdoor ambienttemperature ranged between 65 degrees to 80 degrees Fahrenheit.

The results of the temperature measurements at the pertinent locations1-5 on vehicle 28 for Test Conditions 1-7 are summarized in Table 1

                  TABLE 1                                                         ______________________________________                                        Results of Temperature Measurements at Varying Locations on the               Vehicle Under Seven Test Conditions                                           TEST                                                                          CONDI- Temp. at Temp. at Temp. at                                                                             Temp. at                                                                             Temp. at                               TION   L1       L 2      L3     L 4    L 5                                    ______________________________________                                        1.     900° F.                                                                         1100° F.                                                                        700° F.                                                                       400° F.                                                                       n.a.                                   2.     990° F.                                                                         1100° F.                                                                        250° F.                                                                       150° F.                                                                       n.a.                                   3.     900° F.                                                                         1100° F.                                                                        400° F.                                                                       200° F.                                                                       90° F.                          4.     900° F.                                                                         1100° F.                                                                        200° F.                                                                       150° F.                                                                       80° F.                          5.     900° F.                                                                         1100° F.                                                                        1100° F.                                                                      900° F.                                                                       300° F.-                                                               500° F.                         6.     900° F.                                                                         1100° F.                                                                        400° F.                                                                       200° F.                                                                       90° F.                          7.     900° F.                                                                         1100° F.                                                                        200° F.                                                                       150° F.                                                                       80° F.                          ______________________________________                                    

(n.a.=not applicable)

The results of the pyrometer measurements clearly demonstrate theadvantages of the present invention in removing excessive heat build upin the vehicle's exhaust gas system.

Comparing the temperature measurements at locations 3 and 4 (L3, L4) forTest Conditions 1 and 2 clearly demonstrates that merely using thecooling fin retrofit around the existing mufflers of a vehicle havingground effects significantly reduces the excessive heating to thelocation behind the muffler outlet tube 46 and at the end of the tailpipe 42. This significant reduction in heat build-up translates intolessened deterioration of the vehicle's exterior, lessened discoloringof the vehicle's paint, lessened wrinkling of the plastic parts, e.g.,plastic bumpers and plastic ground effects. It also translates intobetter passenger comfort because there are cooler floor pan areas andpassenger compartments. Furthermore, the ignition problem of combustiblematerials near the muffler and tail pipe is lessened.

Comparing the temperature measurements of Test Conditions 3 and 6 withTest Condition 5 at locations 4 and 5 (L4, L5) clearly shows theadvantages of using each of the two embodiments of the side exhaust piperetrofit of the present invention as compared to a convention method ofusing the unmodified DYNOMAX™ exhaust system as a side exhaust pipe.Test Conditions 3, 6 and 5 are important because in these testconditions the side exhaust pipe is located on the side of the vehiclejust below the vehicle door. This location of the side pipe provides thepleasurable sound of the engine near the driver and also provides thebeautiful appearance of the chrome coated side exhaust pipe, both veryimportant features for the car or truck enthusiast. The temperaturereductions at locations 4 and 5 using the present invention are asurprisingly large and unexpectedly advantageous cooling effect. Whilepreserving the pleasurable engine sounds and the beautiful look soughtby the enthusiast, the present invention is safer for persons and petswho contact the side exhaust pipe 62 or the shield 126 when entering andexiting from the vehicle 28 after the vehicle 28 has been operating.Advantageously, the chrome coating of the side exhaust pipe 62 is notsubject to blues-out or browning-out in the side exhaust pipe retrofitof the present invention; the chrome coating remains unchanged as to itsluster, shine shape and appearance. Furthermore, the decrease in heatbuild up provides lessened deterioration of the vehicle's exterior,lessened discoloring of the vehicle's paint, lessened wrinkling of theplastic parts, e.g., plastic bumpers and plastic ground effects. It alsoprovides better passenger comfort because the floor pan areas andpassenger compartments are cooler. Also, the ignition problem ofcombustible materials near the muffler and tail pipe is lessened.

Comparing the temperature measurements of Test Conditions 4 and 7 withTest Condition 5 at locations 4 and 5 (L4, L5) clearly shows theadvantages of using each of the two embodiments of the exhaust gascooling system 20 of the present invention as compared to a conventionalmethod of using the unmodified DYNOMAX™ exhaust system as a side exhaustpipe. The advantages of this decrease in heat is similar to theadvantages, the disclosure of which are hereby incorporated byreference, listed in the previous paragraph in the comparison of TestConditions 3 and 6 to Test Condition 5 at locations 4 and 5 (L4, L5).

Comparing the temperature measurements of Test Conditions 4 and 7 (withthe side exhaust pipe retrofit) with temperature measurements of TestConditions 3 and 6 (with the side exhaust pipe retrofit and with thecooling fin system retrofit) also show a reduction in temperatures atlocations 3, 4, and 5 (L3, L4, L5). This illustrates the advantage inusing the exhaust gas cooling system over using just the side exhaustpipe retrofit. The exhaust gas cooling system retrofit, using both theside exhaust pipe retrofit and the cooling fin system retrofit of thepresent invention provides even greater cooling to the floor pan areasand the passenger compartment of the vehicle, preventing the heat stressof any plastic parts or ground effect or heat stress to the paint of thevehicle, while also increasing the cooling of the shield and the end ofthe side exhaust pipe and preserving the gorgeous chrome finish of theside exhaust pipe. This of course provides yet greater safety to pets orpersons who may come into contact with these parts, as well as lesseningthe danger of ignition of combustible materials near these threelocations (L3, L4, L5).

While the present invention has now been described and exemplified withsome specificity, those skilled in the art will appreciate the variousmodifications, including variations, additions, and omissions, that maybe made in what has been described. Accordingly, it is intended thatthese modifications also be encompassed by the present invention andthat the scope of the present invention be limited solely by thebroadest interpretation that lawfully can be accorded the appendedclaims.

What is claimed is:
 1. An exhaust gas exit pipe comprising:a firstportion having a pair of first portion ends and a first portion pipebody extending between the pair of first portion ends, the pipe bodyhaving an outside wall, an inside diameter and a plurality of mixingportions, each mixing portion of the plurality of mixing portionsconfigured to mix and cool exhaust gases from a muffler of a vehicle,but not to restrict the flow of the exhaust gases; a second portionhaving a base and an arm extending from the base, the base fastened toone end of the pair of first portion ends; and a third portion having apair of opposing curved ends and an elongate exhaust pipe middle partextending between the pair of opposing curved ends, one of the pair ofopposing curved ends fastened to the arm of the second portion.
 2. Theexhaust gas exit pipe of claim 1, where the plurality of mixing portionsis a plurality of bends with each bend of the plurality of bends bent ata bend angle.
 3. The exhaust gas exit pipe of claim 2, wherein each bendangle ranges between approximately 10 degrees to approximately 45degrees.
 4. The exhaust gas exit pipe of claim 2, wherein the pluralityof bends is 3 bends to 5 bends.
 5. The exhaust gas exit pipe of claim 2,wherein the plurality of bends is four bends.
 6. The exhaust gas exitpipe of claim 5, wherein a first bend of the four bends has a bend angleof approximately 10 degrees, a second bend of the four bends has a bendangle of approximately 15 degrees, a third bend of the four bends has abend angle of approximately 35 degrees and a fourth bend of the fourbends has a bend angle of approximately 45 degrees, with the fourth benddisposed at the first portion end fastened to the base of the secondportion.
 7. The exhaust gas pipe of claim 1, wherein the plurality ofmixing portions are a plurality of internal mixing fins disposed withinthe first portion.
 8. The exhaust gas pipe of claim 7, wherein theplurality of internal mixing fins are oriented to create a counterswirling of the exhaust gases from one internal mixing fin to anotherinternal mixing fin of the plurality of internal mixing fins.
 9. Theexhaust gas pipe of claim 1, wherein the pipe body comprises a pluralityof connectable segments, search segment having one mixing portion of theplurality of mixing portions therein, each mixing portion of theplurality of mixing portions comprising an internal mixing fin.
 10. Theexhaust gas pipe of claim 9, wherein each segment has a segment firstend and a segment second end, an first end inner wall, the internalmixing fin disposed within the segment and oriented spaced from thesegment first end, perpendicular to the first end inner wall and angledwith respect to the segment first end.
 11. The exhaust gas pipe of claim10, wherein the internal mixing fin is angled approximately 45 degreesor approximately 135 degrees to the segment first end.
 12. The exhaustgas pipe of claim 9, wherein the internal mixing fin is disposed withina segment in an orientation to create a swirling of the exhaust gases.13. The exhaust gas pipe of claim 9 wherein the plurality of connectablesegments is 3 segments to 5 segments.
 14. The exhaust gas pipe of claim1, wherein the first portion is dimensioned to extend from the mufflerof the vehicle forward to a position just behind a front wheel of thevehicle at a front end of the vehicle.
 15. The exhaust gas pipe of claim1, wherein the first portion further includes a "J" shaped portiondisposed between one end of the pair of opposed ends and a first mixingportion of the plurality of mixing portions, the "J" shaped portionhaving a forward directed portion and a bend portion wherein the forwarddirected portion extends between bend portion and the first mixingportion.
 16. The exhaust gas exit pipe of claim 1, the arm of the secondportion when joined to one of the pair of opposing curved ends of thethird portion is dimensioned to extend laterally across an underbody ofthe vehicle to an exterior side of the vehicle.
 17. The exhaust gas pipeof claim 1, wherein the third portion includes a shield.
 18. The exhaustgas pipe of claim 17, wherein the shield includes an arc-shaped portion.19. The exhaust gas pipe of claim 18, wherein the arc-shaped portion ofthe shield has a plurality of ventilation holes therein.
 20. The exhaustgas pipe of claim 1, wherein the elongate exhaust pipe middle partextends along an exterior side of the vehicle under a door of thevehicle.
 21. A side exhaust pipe retrofit for a vehicle comprising:(a)an exhaust gas exit pipe; (b) a first clamp for fastening the exhaustgas exit pipe to a muffler of a vehicle; (c) a mounting strap forfastening the exhaust gas exit pipe to an H pipe or a Y pipe of thevehicle; and (d) a second clamp and a pair of rubber grommets formounting the exhaust gas exit pipe to an exterior side of the vehiclebelow a door of the vehicle;wherein the exhaust gas exit pipe comprises:a first portion having a pair of first portion ends and a first portionpipe body extending between the pair of first portion ends, the pipebody having an outside wall, an inside diameter, and a plurality ofmixing portions, each mixing portion of the plurality of mixing portionsconfigured to mix and cool exhaust gases from a muffler of a vehicle,but not to restrict the flow of the exhaust gases; a second portionhaving a base and an arm extending from the base, the base fastened toone end of the pair of first portion ends at a point of fastening; and athird portion having a pair of opposing curved ends and an elongateexhaust pipe middle part extending between the pair of opposing curvedends, one of the pair of opposing curved ends fastened to the arm of thesecond portion; wherein one end of the pair of opposed ends of the firstportion of the exhaust gas exit pipe is fastened to the muffler of thevehicle with the first clamp; the mounting clamp is fastened to both thepoint of fastening of the first portion and the second portion of theexhaust gas exit pipe and to the H pipe or the Y pipe of the vehicle;and the pair of rubber grommets are mounted to the exterior side of thevehicle below the door of the vehicle and to the elongate middle portionof the third portion of the exhaust gas exit pipe with the second clamp.22. The side exhaust pipe retrofit of claim 21, wherein the thirdportion of the exhaust gas exit pipe includes a shield.
 23. A sideexhaust pipe retrofit kit comprising:(a) an exhaust gas exit pipe; (b) afirst clamp for fastening the exhaust gas exit pipe to a muffler of avehicle; (c) a mounting strap for fastening the exhaust gas exit pipe toan H pipe or a Y pipe of the vehicle; and (d) a second clamp and a pairof rubber grommets for mounting the exhaust gas exit pipe to an exteriorside of the vehicle below a door of the vehicle;wherein the exhaust gasexit pipe comprises: a first portion having a pair of first portion endsand a first portion pipe body extending between the pair of firstportion ends, the pipe body having a plurality of mixing portions, anoutside wall and an inside diameter, each mixing portion of theplurality of the plurality of mixing portions configured to mix and coolexhaust gases from a muffler of a vehicle, but not to restrict the flowof the exhaust gases; a second portion having a base and an armextending from the base, the base fastened to one end of the pair offirst portion ends at a point of fastening; and a third portion having apair of opposing curved ends and an elongate exhaust pipe middle partextending between the pair of opposing curved ends, one of the pair ofopposing curved ends fastened to the arm of the second portion; whereinone end of the pair of opposed ends of the first portion of the exhaustgas exit pipe is fastened to the muffler of the vehicle with the firstclamp; wherein the mounting clamp is fastened to both the point offastening of the first portion and the second portion of the exhaust gasexit pipe and to the H pipe or the Y pipe of the vehicle; and whereinthe pair or rubber grommets are mounted to the exterior side of thevehicle below the door of the vehicle and to the elongate middle portionof the third portion of the exhaust gas exit pipe with the second clamp.24. The side exhaust pipe retrofit of claim 23, wherein the thirdportion of the exhaust gas exit pipe includes a shield.
 25. The sideexhaust pipe retrofit kit of claim 23, further comprising a mufflerexternal to the exhaust gas exit pipe.
 26. The side exhaust piperetrofit kit of claim 23, wherein the first portion of the exhaust gasexit pipe includes a first mixing portion of the plurality of mixingportions and a "J" shaped portion, the "J" shaped portion disposedbetween the first portion end and the first mixing portion.
 27. Anexhaust gas cooling system kit comprising: a cooling fin kit and a sideexhaust pipe retrofit kit;wherein the cooling fin kit comprises one ormore cooling fins, each cooling fin having a base with a pair of uprightarms extending therefrom; one of the pair of upright arms having a lip,the base and pair of upright arm portions having clamp receivingapertures portions therein forming a pair of clamp receiving apertures;and wherein the side exhaust pipe retrofit kit comprises (a) an exhaustgas exit pipe; (b) a first clamp for fastening the exhaust gas exit pipeto a muffler of a vehicle; (c) a mounting strap for fastening theexhaust gas exit pipe to an H pipe or a Y pipe of the vehicle; and (d) asecond clamp and a pair of rubber grommets for mounting the exhaust gasexit pipe to an exterior side of the vehicle below a door of thevehicle;wherein the exhaust gas exit pipe comprises: a first portionhaving a pair of first portion ends and a first portion pipe bodyextending between the pair of first portion ends, the pipe body having aplurality of mixing portions, an outside wall and an inside diameter,each mixing portion of the plurality of the plurality of mixing portionsconfigured to mix and cool exhaust gases from a muffler of a vehicle,but not to restrict the flow of the exhaust gases; a second portionhaving a base and an arm extending from the base, the base fastened toone end of the pair of first portion ends at a point of fastening; and athird portion having a pair of opposing curved ends and an elongateexhaust pipe middle part extending between the pair of opposing curvedends, one of the pair of opposing curved ends fastened to the arm of thesecond portion; wherein one end of the pair of opposed ends of the firstportion of the exhaust gas exit pipe is fastened to the muffler of thevehicle with the first clamp; wherein the mounting clamp is fastened toboth the point of fastening of the first portion and the second portionof the exhaust gas exit pipe and to the H pipe or the Y pipe of thevehicle; and wherein the pair or rubber grommets are mounted to theexterior side of the vehicle below the door of the vehicle and to theelongate middle portion of the third portion of the exhaust gas exitpipe with the second clamp.
 28. The exhaust gas cooling system kit ofclaim 27, wherein the third portion of the exhaust gas exit pipeincludes a shield.
 29. The exhaust gas cooling system kit of claim 27,further comprising a muffler external to the exhaust gas exit pipe. 30.The exhaust gas cooling system kit of claim 27, wherein the firstportion of the exhaust gas exit pipe includes a first mixing portion ofthe plurality of mixing portions and a "J" shaped portion, the "J"shaped portion disposed between the first portion end and the firstmixing portion.
 31. The exhaust gas cooling system kit of claim 27,wherein the cooling fin kit further comprises one or more adjustableclamps, each of the adjustable clamps dimensioned to engage within apair of clamp receiving apertures of one or more of the cooling fins andeach of the adjustable clamps either by itself or in combination withone or more adjustable clamps dimensioned to extend around an object tobe cooled.